排列与二进制

#include<iostream>
using namespace std;
int count_two(int n,int m){
	int count=0;
	for(int i=0;i<m;i++){ //统计2的因子个数 
		int num=n-i;
		while(num%2==0){
			count++;
			num /=2;
		}
	}
	return count;
}
int main(){
	int n,m;
	while(1){
		cin >> n >> m;
		if(n==0 && m==0)
			break;
		int cnt=count_two(n,m);
		cout << cnt << endl ;	
	}
	
	return 0;
}