#include <stdio.h>
#define N 100
main(void)
{
  int i, j;
  int a=0;
  for (i=1; i<N; i++) 
    for (j=1; j<N; j++)
      if (i*i + j*j < N*N) a++;
  printf("pi is nearly %.10f\n", ((double) a)/(N*N)*4);
}