import java.io.*;
import java.util.*;

public class Main {
    static int mod;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        mod = sc.nextInt();
        int n = sc.nextInt();
        int[] values = new int[n];
        for (int i = 0; i < n; i++) {
            values[i] = sc.nextInt();
        }
        long ans = values[0];
        char[] opps = sc.next().toCharArray();
        for (int i = 1; i < n; i++) {
            if (opps[i - 1] == '+') {
                ans += values[i];
            } else if (opps[i - 1] == '-') {
                ans += mod - values[i];
            } else if (opps[i - 1] == '*') {
                ans *= values[i];
            } else {
                ans *= pow(values[i], mod - 2);
            }
            ans %= mod;
        }
        System.out.println(ans);
    }
    
    static long pow(long x, int p) {
        if (p == 0) {
            return 1;
        } else if (p % 2 == 0) {
            return pow(x * x % mod, p / 2);
        } else {
            return pow(x, p - 1) * x % mod;
        }
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}