#include <vector>
#include <algorithm>
#include <iostream>
#include <set>
#include <cmath>
#include <map>
#include <random>
#include <cassert>
#include <ctime>
#include <cstdlib>
#include <limits.h>
using namespace std;
long long binPow (long long x, long long y) {
if (y == 0) {
return 1;
}
return x * binPow(x, y - 1);
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n;
cin >> n;
vector<string> vec(n);
int64_t ans = 0;
for (int i = 0; i < n; i++) {
cin >> vec[i];
char c = vec[i].back();
vec[i].pop_back();
ans += binPow(stoll(vec[i]), c - '0');
}
cout << ans;
}
