UVa 10300 Ecological Premium

#include <stdio.h>
int main(){
int n;
scanf("%d", &n);
while(n--){
int f,sum = 0;
scanf("%d", &f);
while(f--){
int a,b,c;
scanf("%d %d %d", &a, &b, &c);
sum += (a*c);
}
printf("%d\n",sum);
}
return 0;
}