// editor3
#include<stdio.h>
int main(){
    int m1;
    int m2;
    
    scanf("%d",&m1);
    scanf("%d",&m2);
    
    totalmass=m1 + m2;
    
    if (m1 <0 || m2 <0);
    printf("Invalid input");
    
    else:
    printf("%d",totalmass);
    
    return 0;
    
    
    
}