#include <stdlib.h> 
#include <stdio.h> 
#define z RAND_MAX
#define _ rand() 
#define s ++
#define q double
int main(void) {q x,y,t=0,i=0,c=0,j=(q)z*z;while(s c,s t){x=_;y=_;
if(x*x+y*y<j)i s;if(1000000.0<c)printf("%1.11f\n",i/t*4.0),c=0;}}