#include<bits/stdc++.h> using namespace std; int a[1000000],b[1000000],c[1000000]; int main(){ int i=0; while(1){ cin>>a[++i]>>b[i]; c[i]=a[i]+b[i]; if(a[i]==0&&a[i]==0) break; } for(int j=1;j<=i-1;j++) cout<<c[j]<<endl; return 0; }