#include<stdio.h>

int add(*n1,*n2)
{
    int sum;
    sum=*n1+*n2;
    return sum;
}
in main()
{
    int n1,n2;
    scanf("%d",&n1);
    scanf("%d",&n2);
    if(n1<0 && n2<0)
    {
        printf("Invalid Input");
        return 0;
    }
    add(&n1,&n2);
}