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

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();
        long ans = sc.nextInt();
        int[] values = new int[n - 1];
        for (int i = 0; i < n - 1; i++) {
            values[i] = sc.nextInt();
        }
        char[] opes = sc.next().toCharArray();
        for (int i = 0; i < n - 1; i++) {
            if (opes[i] == '+') {
                ans += values[i];
            } else if (opes[i] == '-') {
                ans += MOD - values[i];
            } else if (opes[i] == '*') {
                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 Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    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 int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}