hdu 6043

/*

找规律, 发现有循环节

*/

#include <cstdio>int main(){    long long n, k;    int cas = 1;    while (scanf("%lld%lld", &n, &k) != EOF){        long long ans;        if (k <= n)            ans = k;        else{            k -= n;            k %= (long long)2 * (n - 1);            if (k == 0)                ans = n;            else {                k %= (n - 1);                if (k == 0){                    ans = (n - 1);                }                else{                    ans = k;                }            }        }        printf("Case #%d: %lld\n", cas++, ans);    }}