#include <iostream> using namespace std; int main() { int num[1001],n,i,sum=0,min=1000,he; cin >> n; for(i=1;i<=n;i++) { cin >> num[i]; sum+=num[i]; cin >> money[i]; if(money[i]<min) { min=money[i]; } } he=sum*min; cout << he; return 0; }