import sys
input=lambda: sys.stdin.readline().rstrip()
p,n=map(int,input().split())
A=[int(i) for i in input().split()]
S=input()
ans=A[0]
for i in range(n-1):
  if S[i]=="+":
    ans=ans+A[i+1]
  if S[i]=="-":
    ans=ans-A[i+1]
  if S[i]=="*":
    ans=ans*A[i+1]
  if S[i]=="/":
    ans=ans*pow(A[i+1],p-2,p)
print(ans)