PI

#include <stdio.h>
#pragma warning(disable:4996)
#define SCALE      10000
#define MAX_ARRAY   200000
#define ARRAY_INIT  2000

int main(void)
{
    int i, j, sum, carry = 0;
    int array[MAX_ARRAY + 1];
    int inin;

    for (i = 0; i <= MAX_ARRAY; ++i) array[i] = ARRAY_INIT;

    for (i = MAX_ARRAY; i; i -= 14) {
        sum = 0;
        for (j = i; j > 0; --j) {
            sum = sum * j + SCALE * array[j];
            array[j] = sum % (j * 2 - 1);
            sum /= (j * 2 - 1);
        }

        printf("%04d", carry + sum / SCALE);
        carry = sum % SCALE;
    }
}