diff --git a/quad10/fenomens/lab/p3/MC-2.f90 b/quad10/fenomens/lab/p3/MC-2.f90
new file mode 100644
index 0000000..20efdca
--- /dev/null
+++ b/quad10/fenomens/lab/p3/MC-2.f90
@@ -0,0 +1,117 @@
+program main
+  use, intrinsic :: iso_c_binding, only: sp=>c_float, dp=>c_double
+  implicit none
+  integer*4, PARAMETER :: L = 32
+  integer*2 :: S(1:L, 1:L)
+  real*8 :: MAGNE, ENERG, TEMP, E, DIFE, DELTA, M, SUMA, W(-8:8), genrand_real2
+  integer*4 :: PBC(0:L+1), I, J, IMC, MCTOT, MCINI, MCD, IPAS, N, SEED, NSEED, SEED0
+  character :: TEMPSTRING*100, str*20
+  character(:), allocatable :: NOM
+
+  integer :: SUMI
+  real(dp) :: SUME, SUME2, SUMM, SUMAM, SUMM2, VARE, VARM
+
+  if (command_argument_count() < 1) then
+    print *, "Error: please supply a command-line argument with the"
+    print *, "temperature, via './mc1 {TEMPERATURE}', where {TEMPERATURE}"
+    print *, "is the temperature."
+    stop
+  endif
+
+  ! Inicialitzem algunes variables sobre el problema
+  call get_command_argument(1, TEMPSTRING) ! Ex: 2.0d0
+  TEMPSTRING = trim(adjustl(TEMPSTRING))
+  read (TEMPSTRING, *) TEMP
+  NSEED = 10
+  SEED0 = 117654
+  MCTOT = 10000
+  MCINI = 1000
+  MCD = 10
+  N = L*L
+  NOM = "out_data/" // "SIM-L-" // trim(str(L)) // "-TEMP-" // &
+      trim(str(int(1000*TEMP))) // "-MCTOT-" // trim(str(MCTOT))
+
+  ! Obrim el fitxer on escriurem els resultats a cada iteració
+  open(unit = 12, file = NOM // ".out")
+
+  ! Inicialitzem variable que ens fa latent la periodicitat
+  PBC(0) = L
+  PBC(L + 1) = 1
+  do I = 1, L
+    PBC(I) = I
+  enddo
+
+  ! Cache dels valors de l'exponencial
+  do I = -8, 8
+    W(I) = exp(-float(I)/TEMP)
+  enddo
+
+  do SEED = SEED0, SEED0 + NSEED - 1
+    print *, "Seed: ", SEED
+
+    ! Inicialitzem la matriu d'spins aleatòriament
+    call WRITECONFIGSEED(S, L, SEED)
+
+    E = ENERG(S, L, PBC)
+    M = MAGNE(S, L)
+    print *, "Energia inicial:", E, "Magnet. inicial:", M
+    write (12, *) "0", E, M
+
+    ! Iterem amb el mètode de Montecarlo
+    do IMC = 1, MCTOT
+      do IPAS = 1, N
+        ! LOS LOOPS HACEN COSAS
+        I = INT(genrand_real2()*L) + 1
+        J = INT(genrand_real2()*L) + 1
+        SUMA = S(PBC(I - 1), J) + S(PBC(I + 1), J) + S(I, PBC(J - 1)) + S(I, PBC(J + 1))
+        DIFE = 2*SUMA*S(I, J)
+
+        if (DIFE > 0) then
+          DELTA = genrand_real2()
+          if (DELTA >= W(int(DIFE))) then
+            ! NO ho acceptem
+            cycle
+          endif
+        endif
+
+        ! Sí ho acceptem:
+        S(I, J) = -S(I, J)
+        E = E + DIFE
+        M = M + 2*S(I, J)
+      enddo
+
+      if (mod(IMC, 1000) == 0) then
+        print *, "Iter:", IMC, "Energia:", E, "Magn:", INT(M)
+      endif
+      write (12, *) IMC, E, M
+
+      if (IMC > MCINI .and. mod(IMC, MCD) == 0) then
+        SUMI = SUMI + 1
+
+        SUME = SUME + E
+        SUME2 = SUME2 + E*E
+
+        SUMM = SUMM + M
+        SUMAM = SUMAM + abs(M)
+        SUMM2 = SUMM2 + M*M
+      endif
+    enddo
+  enddo
+
+  ! Normalitzem els promitjos
+  SUME = SUME/SUMI
+  SUME2 = SUME2/SUMI
+  SUMM = SUMM/SUMI
+  SUMAM = SUMAM/SUMI
+  SUMM2 = SUMM2/SUMI
+  VARE = SUME2 - SUME*SUME
+  VARM = SUMM2 - SUMM*SUMM
+
+  ! Guardem a un fiter els promitjos
+  open(unit = 13, file = NOM // ".res")
+  write(13, *) L, TEMP, SUMI, SUME, SUME2, VARE, SUMM, SUMAM, SUMM2, VARM
+
+  ! Tanquem els fitxers de sortida
+  close(12)
+  close(13)
+endprogram main