#include <stdio.h>

int main()
{
int c;
float i = 1;
float j = 3;
float p = 0;
float pi = 0;

p = 1/i - 1/j;

for(c=0;c<500000000;c++)
{
i = i + 4;
j = j + 4;
p = p + 1/i;
p = p - 1/j;
pi = 4 * p;
printf("%f.0\t%f.8\n",i,pi);
}
return(0);
}