#include <bits/stdc++.h>   using namespace std;   long long a, b, c, n, m, k, x, y, z, cnt, ans, tt;   string s;   vector<long long> v, q, t;   int main() {     long long c0, c1, h;     cin >> tt;     while (tt--) {       cin >> n >> c0 >> c1 >> h >> s;       cnt = 0;       ans = 0;       for (long long i = 0; i < s.size(); i++) {         if (s[i] ==  1 )           cnt++;         else           ans++;       }       if (c0 == c1)         cout << c0 * n <<   n ;       else if (c0 + h < c1)         cout << c0 * n + (cnt * h) <<   n ;       else if (c1 + h < c0)         cout << (c1 * n) + (ans * h) <<   n ;       else         cout << (c1 * cnt) + (c0 * ans) <<   n ;     }   }   