#include<bits/stdc++.h> using namespace std; int getbits(int n)//统计(n)bin中的1的个数 { int res=0; while(n) { res++; n=n&(n-1); } return res; } int cmp(int a,int b)//统计a,b中the number of different bits in the binary format of a and b. { return getbits(a^b); } int main() { int a,b; while(cin>>a>>b) cout<<cmp(a,b)<<endl; return 0; }