import java.util.*;
class main
{
    public static int main(String[]args)
    {
        Scanner sc = new Scanner(System.in);
        if(!sc.hasNextInt())
        {
            System.out.print("Invalid input");
        }
        else{
        int a=sc.nextInt();
        if(-32768>=a )
        {
            System.out.print("Invalid input");
            return;
        }
        if(!sc.hasNextInt())
        {
            System.out.print("Invalid input");
            return;
        }
        else{
        int b=sc.nextInt();
        if(32768<=b )
        {
            System.out.print("Invalid input");
            return;
        }
        int c=a+b;
        if(c>0)
        {
        System.out.print(a+b);
        return c;
        }
        else{
        
            System.out.print("Invalid input");}
        }}
    }
}