#include<stdio.h>
int main() {
    int n;
    scanf("%d", &n);
    char name[100];
    int id, type;
    double salary, total = 0;
    for (int i = 0; i < n; i++) {
        scanf("%s %d %d", name, &id, &type);
        scanf("%1f", &salary);
        total += salary;
    }
    printf("%.2f", total);
    return 0;
}