#include<iostream>
using namespace std;
long mod,N,A[1<<17];
string S;
long power(long a,long b){return b?power(a*a%mod,b/2)*(b%2?a:1)%mod:1;}
main()
{
	cin>>mod>>N;
	for(int i=0;i<N;i++)cin>>A[i];
	cin>>S;
	long X=A[0];
	for(int i=0;i<N;i++)
	{
		if(S[i]=='+')X=(X+A[i+1])%mod;
		else if(S[i]=='-')X=(X+mod-A[i+1])%mod;
		else if(S[i]=='*')X=X*A[i+1]%mod;
		else if(S[i]=='/')X=X*power(A[i+1],mod-2)%mod;
	}
	cout<<X<<endl;
}