#include<stdio.h>
typedef struct prut
{
char mc[101];
double dj;
int sl;
}prut;
int main()
{
int n,i;
double sum=0;
prut s[100];
scanf("%d",&n); for(i=0;i<n;i++)
{
scanf("%s %lf %d",s[i].mc,&s[i].dj,&s[i].sl);
sum+=s[i].dj*s[i].sl;
}
printf("%.6lf",sum);
return 0;
}
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