func_code_string: #include <bits/stdc++.h>   using namespace std;   double t, k, d, start = 0, sum = 0;   int main() {     scanf( %lf%lf%lf , &k, &d, &t);     if ((long long)k % (long long)d == 0)       printf( %.1f n , t);     else if (k >= t)       printf( %.1f n , t);     else {       if (k > d) {         long long a = k / d;         d *= a + 1;       }       long long x = (long long)t / (k + (d - k) / 2);       start = (double)x * d;       sum = (double)x * (k + (d - k) / 2);       sum = t - sum;       if (sum > k)         start += k + (sum - k) * 2;       else         start += sum;       printf( %.9f n , start);     }     return 0;   }   