#include <bits/stdc++.h>

int ri() {
    int n;
    scanf("%d", &n);
    return n;
}

int mpow(int a, int b, int mod) {
    int res = 1;
    for (; b; b >>= 1) {
        if (b & 1) res = (int64_t) res * a % mod;
        a = (int64_t) a * a % mod;
    }
    return res;
}

int main() {
    int p = ri();
    int n = ri();
    int a[n];
    for (auto &i : a) i = ri();
    std::string s;
    std::cin >> s;
    int cur = a[0];
    for (int i = 0; i + 1 < n; i++) {
        if (s[i] == '+') {
            cur += a[i + 1];
            if (cur >= p) cur -= p;
        } else if (s[i] == '-') {
            cur -= a[i + 1];
            if (cur < 0) cur += p;
        } else if (s[i] == '*') {
            cur = (int64_t) cur * a[i + 1] % p;
        } else {
            cur = (int64_t) cur * mpow(a[i + 1], p - 2, p) % p;
        }
    }
    printf("%d\n", cur);
    return 0;
}