include<iostream>

include<stdio.h>

include<string.h>

static double sum=0;
using namespace std;
class prut
{
public:
char name[10];
double money;
double num;

prut(char a[10],double x,double y){strcpy(name,a);money=x;num=y;}
prut(){}

};
int main()
{double g,h; char j[10];
int m;
cin>>m;
prut q[10]; //定义对象数组
for(int i=0;i<m;i++) { cin>>j>>g>>h;
q[i]=prut(j,g,h);

 } 
for(int t=0;t<m;t++)
sum=sum+q[t].money*q[t].num;//加和
printf("%.6lf",sum);
return 0;

}