#include <stdio.h>
#include <math.h>

#define RADIX 3.14159265358979323

int main(int argc, char * argv[])
{
    if (argc != 2)
    {
        printf("Usage:\n");
        printf(" pi decnum\n");
    }
    else
    {
        double src;
        int max_deg, min_deg, cur_deg;

        src = 0.0;
        sscanf(argv[1], "%lf", &src);

        max_deg = 1;
        min_deg = -5;
        while (pow(RADIX, (double)max_deg) < src) ++max_deg;

        for (cur_deg = max_deg - 1; cur_deg > min_deg; --cur_deg)
        {
            double d = pow(RADIX, cur_deg);
            char digit = 0;

            while (src > d)
            {
                ++digit;
                src -= d;
            }

            printf("%d", digit);
            if (cur_deg == 0) printf(".");
        }
    }
    printf("\n");
    return 0;
}