#include <iostream>
using namespace std;
int main() {
int taman [10];
int kilos [10];
int n ;
int i ;
int sum=0;
for ( i= 0 ; i<n ; i++) {
cin >> taman [i];
cin >> kilos [i];
sum = sum + taman [i] *kilos [i];
}
return 0;
}
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