#include <stdio.h>
int main()
{
    int reactant1,reactant2;
    if(scanf("%d %d",&reactant,&reactant2)!=2)
    {
        printf("Invalid input");
        return 0;
    }
    if(reactant1<0||reactant2<0)
    {
        printf("Invaild input");
    }
    else
    {
        int total=reactant1+reactant2;
        print("%d",total);
    }
    rerturn 0;
}