#include <stdio.h>

int main(void)
{

    float x, sum, d;
    int i;
    printf("Sisesta arv: ");
    scanf(" %f", &x);

    sum = 0;
    d = 1;

    for(i = 1; i <= 30; i++)
    {
        
        if(i<30)
        {
            sum = sum + d;
            d = (d * x) / i;
            
        }
        
        i=i+1;
        
    }

    printf("%0.3f \n",sum);

    return 0;
}