#include <iostream> using namespace std; int main(){ int num[1001],money[1001],n,i,sum=0,min=1000,he,on; cin >> n; for(i=1;i<=n;i++){ cin >> num[i]; sum+=num[i]; cin >> money[i]; if(money[i]<min){ min=money[i]; on=i; } } if(on=1)he=sum*min; if(on=2)he=num[1]*money[1]+min*(sum-num[1]); if(on=3)he=num[1]*money[1]+num[2]*money[2]+num[3]*money[3]; cout << he; return 0; }