#include<stdio.h>
int main()
{
    int first_reactent;
    int second_reactant;
    if(scanf("%d",&first_reactant) !=1 ||
       scanf("%d",&second_reactant) !=1)
       {
           printf("Invalid input");
           return 0;
       }
       if(first_reactant<0 || second_reactant<0)
       {
           printf("Invalid input");
           return 0;
           
       }
       int total_mass=first_reactant+second_reactant;
       printf("%d",total_mass);
       return 0;
       
}