#include<stdio.h>
int main()
{
    int reaction1;
    int reaction2;
    int mass;
    scanf("%d",&reaction1);
    scanf("%d",&reaction2);
    if(reaction1>0&&reaction2>0)
    {
        mass=reaction1+reaction2;
        printf("%d",mass);
    }
    else 
    {
        printf("Invalid input");
    }
    return 0;
}
    
    
    
    
    ]