#include <stdio.h>
int main()
{
    int reactant1, reactant2 ;
    if (scanf("%d %d ", &reactant1, &reactant2) !=2){
    printf("Invalid input ");
    return 0;
}
if (reactant1 < 0 || reactant2 < 0 || reactant1 > 1000 || reactant2 > 1000){
    printf("Invalid input");
}
else{
    int totalMass = reactant1 + rectant2;
    printf("%d", totalMass);
}
return 0;
}