20分，有大佬知道怎么回事吗？ B2066题

#include<iostream>
#include<cmath>
using namespace std;
int main(){
	int n,a,b,c;
	double yime = 0;
	cin>>n;
	for(int i = 1;i <= n;i++){
		double lo = 0;
		cin>>a>>b>>c;
		lo = sqrt(a*a+b*b);
		yime = yime + lo/50 + c*1 + c*0.5 + lo/50;
	}
	cout<<ceil(yime)<<endl;
	
	return 0;
}