#!/usr/bin/env python3

import sys
input=sys.stdin.readline

p,n=map(int,input().split())
arr=list(map(int,input().split()))
s=input()
ans=arr[0]
for i in range(1,n):
    if s[i-1]=='+':
        ans+=arr[i]
        ans%=p
    elif s[i-1]=='-':
        ans-=arr[i]
        ans%=p
    elif s[i-1]=='*':
        ans*=arr[i]
        ans%=p
    elif s[i-1]=='/':
        ans*=pow(arr[i],p-2,p)
        ans%=p
print(ans)