p, n = map(int, input().split())
A = list(map(int, input().split()))
S = list(input())

curr = A[0]
for i in range(n - 1):
    if S[i] == '+':
        curr += A[i + 1]
    elif S[i] == '-':
        curr -= A[i + 1]
    elif S[i] == '*':
        curr *= A[i + 1]
    elif S[i] == '/':
        curr *= pow(A[i + 1], p - 2, p)
    curr %= p
print(curr)