def inv(a):
    return pow(a,P-2,P)

P,N=map(int,input().split())
A=[int(x) for x in input().split()]
S=input()

v=A[0]
for i in range(N-1):
    if S[i]=="+":
        v=(v+A[i+1])%P
    elif S[i]=="-":
        v=(v+P-A[i+1])%P
    elif S[i]=="*":
        v=v*A[i+1]%P
    elif S[i]=="/":
        v=v*inv(A[i+1])%P
print(v)