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#include<stdio.h>
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int main()
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{
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int n, i, cas = 0, d, p, l, v;
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while(~scanf("%d%d",&n,&d), n+d)
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{
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double ans = d*1.0;
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for(i = 0; i < n; i++)
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{
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scanf("%d%d%d",&p, &l, &v);
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ans -= l;
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ans += 2.0*l / v;
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}
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printf("Case %d: %.3lf\n\n",++cas, ans);
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}
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return 0;
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}
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