Grass Seed Inc.

#include <bits/stdc++.h>

using namespace std;

int main () {
    long double c;
    cin >> c;
    int l;
    cin >> l;
    long double sum = 0;
    for (int i = 0; i < l; ++i) {
        long double a, b;
        cin >> a >> b;
        sum += a * b;
    }
    cout <<fixed<<setprecision(10)<< sum*c;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED