// editor3
#include <stdio.h>
int main()
{
    int first reactant,second reactant;
    scanf("%d",&first reactant);
    scanf("%d",&second reactant);
    if(first reactant<0 || second reactant<0)
    {
        printf("Invalid input");
    }
    else
    {
        printf("\n%d",first reactant+second reactant);
    }
    return 0;
    
}