func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int x, y, n, tx, ty, m;     scanf( %d %d , &n, &m);     double res = 0;     for (int i = 0; i < n; i++) {       scanf( %d %d , &x, &y);       if (i == 0) {         tx = x, ty = y;         continue;       }       res = res + sqrt(((x - tx) * (x - tx)) + ((y - ty) * (y - ty)));       tx = x, ty = y;     }     if (n == 1) {       res = res + abs(x - y);       printf( %.9f n , res);     } else {       printf( %.9f n , (res / 50.0) * m);     }     return 0;   }   