문제
풀이
#include <iostream>
#include <vector>
using namespace std;
void solve(void) {
vector<int> a(5), l(5);
for (int i=0; i<5; i++) cin >> a[i] >> l[i];
int n, kwf; cin >> n >> kwf;
int sum = 0;
for (int i=0; i<5; i++) sum += a[i] * l[i];
cout << sum / 5 * n / kwf;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}