// editor3
#include<stdio.h>
#include<ctype.h>
typedef struct product
{
    char name[20];
    int qnt;
    float price;
}P;
int main()
{
    int size,ind;
    scanf ("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    P prod[size];
    float total=0;
    for(ind=0;ind<size;ind++)
    {
        scanf("%s",prod[ind].name);
        for(int i=0;prod[ind].name[i]!='/0';i++)
        if(!isalnum(prod[ind].name[i]))
        {
            print("Invalid input");
        }
        scanf("%d",&prod[ind].qnt);
        scanf("%f",&prod[ind].price);
        total+=prod[ind].price;
    }
    printf("%.2f",total);
    return 0;
}