uva 571 jugs

#include <cstdio>int main(){      int na, nb, nDes, ca, cb;      while (scanf("%d %d %d", &ca, &cb, &nDes) != EOF)      {             na = 0, nb = 0;             while (nb != nDes)             {                   if (na == 0)                   {                          puts("fill A");                         na = ca;                   }                   if (nb == cb)                   {                          puts("empty B");                          nb = 0;                   }                   nb += na;                   puts("pour A B");                    if (nb > cb)na = nb - cb, nb = cb;                   else na = 0;              }             puts("success");      }      return 0;}