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a = int(input()) k = 0 A = [[int(j) for j in input().split()] for i in range(a)] b = list(map(int, input().split())) for i in range(len(b)-1): if (A[b[i]-1][b[i+1]-1] == 0): k = 0 break k+=A[b[i]-1][b[i+1]-1] print(k)