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