#include<stdio.h>
#include<stdlib.h>
#include<>
int main(){
	double x,mid ,precision=1e-10;
	int i=0, count=1000;
	printf("¿é¤Jx­È");
	scanf("%lf",&x);
	double upper=x,lower=0;
	mid=(upper+lower)/2;
	
	while (fabs((mid*mid)-x)> precision && i < count){
		mid=(upper+lower)/2;
		printf("#%d\t[%f,%f]\t¸Ñ=%f\n",i+1,lower,upper,mid);
		i++;
		if(fabs(mid-x) <precision){
			break;
		}else if(mid*mid>x){
			upper=mid;
//			lower=mid;
		}else{
//			upper=mid;
			lower=mid;
				
		}
		
		
			
	}
	printf("%f",mid);
	return 0;
}