UVA12230 - Crossing Rivers

#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

int main () {
int cas = 1;
int N;
double D, p, l, v;
while (scanf("%d%lf", &N, &D) == 2 && (N || D)) {
for (int i = 0; i < N; i++) {
scanf("%lf%lf%lf", &p, &l, &v);
D = D - l + 2 * l / v;
}
printf("Case %d: %.3lf\n\n", cas++, D);
}
return 0;
}