class Solution{
public:
    int isHappy(int N){
        
       int sum=0,r;
        while(N!=0)
        {
            r=N%10;
            sum=sum+(r*r);
            N=N/10;
        }
        
        if(sum==1)
        return 1;
        else if(sum<10)
        return 0;
        else
        return isHappy(sum);
        
    }   
};