def determinant(matrix):
       det=0
       print matrix
       small=[]
       s=1
       l=len(matrix)
       if l==1:
              return matrix[0][0]
       for x in range(l-1):
                     small.append([])
       for i in range(l):
              for a in range(1,l):
                     for b in range(l):
                            if b<i:
                                   small[a-1].append(matrix[a][b])
                            elif b>i:
                                   small[a-1].append(matrix[a][b])
              if (i%2)==0:
                    s=1
              else:
                     s=-1
              d=matrix[0][i]
              det+=s*d*determinant(small)
       print det

f=open('in_sec13_7.txt', 'r')
x=str(f.readline())
arr=[]
ch=[]
for line in f:
       arr.append(str(line.split()))
s=len(arr)
for i in arr:
       for j in arr[i]:
              ch[i].append(int(j))
print arr
print ch

n=[[6,4,7,12,1],[0,7,4,4,2],[9,12,15,41,12],[9,7,47,12,4],[8,1,4,2,1]]
nl=[]
for k in range(len(n)):
       nl.append(n[k])
j=determinant(nl)
z=str(j)