#include <stdio.h>
int main(){
    int a;
    int b;
    scanf("%d",&a);
    scanf("%d",&b);
    if((a < 0 || a != int ) && (b < 0 || b != int)){
    printf("Invalid input");
    }
    Total mass= a+b;
    else{
    printf("%d",a,b); 
    }
    return 0;
}