https://www.acmicpc.net/problem/10951
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.StringTokenizer;
public class Main {
public static void main(String args[]) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringBuilder sb = new StringBuilder();
StringTokenizer st;
String str;
while ((str = br.readLine()) != null) {
st = new StringTokenizer(str, " ");
int a = Integer.parseInt(st.nextToken());
int b = Integer.parseInt(st.nextToken());
sb.append(a + b).append("\n");
}
System.out.print(sb);
}
}