A group of N Internet Service Provider companies(ISPs) use a private communication channel that has a maximum capacity of Ctraffic units per second. Each company transfers T traffic units persecond through the channel and gets a profit that is directly proportional tothe factor T(C - T*N). The problem is to compute the smallest value of Tthat maximizes the total profit the N ISPs can get from using thechannel. Notice that N, C, T, and the optimal T are integernumbers.

Input

Input starts with an integer T (≤ 20),denoting the number of test cases.

Each case starts with a line containing two integers Nand C (0 ≤ N, C ≤ 10⁹).

Output

For each case, print the case number and the minimumpossible value of T that maximizes the total profit. The result shouldbe an integer.

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#define LL long long
using namespace std;
int main()
{
    LL n,m,c,i,x,y;
    LL cla;
    scanf("%lld",&cla);
    for(int gr=1; gr<=cla; gr++)
    {
        printf("Case %lld: ",gr);
        scanf("%lld %lld",&n,&c);
        if(n==0||c==0)
        {
            printf("0\n");
            continue;
        }
        printf("%lld\n",(LL) (1.0*c/(2*n)+0.499999 ) );//注意精度问题+0.499999
    }
    return 0;
}

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