import java.io.*;
import java.util.*;
public class Main {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
StringTokenizer st;
while(true) {
st = new StringTokenizer(br.readLine(), " ");
int A = Integer.valueOf(st.nextToken());
int B = Integer.valueOf(st.nextToken());
if(A == 0 && B == 0) {
break;
}
bw.write(String.valueOf(A + B) + "\n");
}
bw.flush();
bw.close();
}
}