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#include <iostream>#include <algorithm>#include <cmath>#include <vector>#include <string>#include <cstring>#pragma warning(disable:4996)using namespace std;int main(){long long n,c;while(scanf("%lld%lld",&n,&c)!=EOF){if(n==0){cout<<0<<endl;continue;}else{long long x=c/(2*n);long long y=x+1;cout<<(x*(c-n*x)<y*(c-n*y)?y:x)<<endl;}}return 0;}