uva12230Crossing Rivers

#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;

int n,d,p,L,v,kase;
double res;

int main() {
    while(scanf("%d%d",&n,&d)==2 && d) {
        res=0;
        for(int i=1;i<=n;i++) {
            scanf("%d%d%d",&p,&L,&v);
            res+=(2*L)/(1.0*v);
            d-=L;
        }
        res+=(double) d;
        printf("Case %d: %.3lf\n\n",++kase,res);
        
    }
    return 0;    
}