#include<stdio.h>
int main(){
    int a , b;
    int sum = a+b;
    scanf("%d%d",&a , &b);
  
  printf("%d",sum);
} 
    if(a < 0 || b < 0) {
        printf("Invalid Input\n");
        
    }else{
    printf("%d\n",sum);
}
return 0;
}