#include <iostream>

using namespace std;

int main() {
    double p[] = {28.9, 32.7, 45.6, 78, 35, 86.2, 27.8, 43, 56, 65};
    int q[10];
  
    for(int i = 0; i < 10; i++) {
        cin >> q[i];
    }
  
    double t = 0;
    for(int i = 0; i < 10; i++) {
        t += p[i] * q[i];
    }
  
    printf("%.1f\n", t);
  
    return 0;
}