> 有什么注意点，wa了两把了
#include<iostream>
#include<algorithm>
using namespace std;

struct In
{
	int x;
	int y;
}arr[50001];
int ans[50001];

int main()
{
	int n;
	while(scanf("%d",&n) && n!=-1)
	{
		int minh=9999999;
		int totalw=0;
		for(int i=0;i<n;i++){
			scanf("%d %d",&arr[i].x,&arr[i].y);
			if(arr[i].y<minh)
				minh=arr[i].y;
			totalw+=arr[i].x;
			ans[i]=arr[i].x*arr[i].y;
		}
		sort(ans,ans+n);
		int s;
		s=totalw*minh;
		printf("%d\n",s>ans[n-1] ? s : ans[n-1]);

	}
	return 0;
}