#include <iostream>
#include <string>
using namespace std;
	int doStuffs(int mid,int a){
	    //your code here
	    if(mid==1){return -1;}
	    if((mid*mid)==a){
	    	cout<< mid;
	    	
	    }
	    
	   	else{
	   		mid=mid/2;
	   		return doStuffs(mid-1,a);
		    if(doStuffs(mid-1,a)==-1){return doStuffs(mid+1,a);}
	   	}
		   
	   	
	}
	int doStuff(int a){
	    //your code here
	    int mid=a/2;
	    if(mid*mid==a){
	    	return mid;
	    	
	    }
	    else{
	    	return doStuffs(mid-1,a);
	    }
	}
	
	int main(){
		
		doStuff(25);
	}