int main()
{
    float x;
    scanf("%f", &x);
    int a = 10 * x;
    float o, w, t, f;
    o = (a % 10); a /= 10;
    w = (a % 10) / 10; a /= 10;
    t = (a % 10) / 100; a /= 10;
    f = (a % 10) / 1000; 
    printf("%f", o + w + t + f);