text: #include <stdio.h>
  int main(){
      int a, b, n;
      scanf("%d %d", &a, &b);
      n = b - a;
      int pr;
      if(n>=401){
          pr = 2615*100 + 2340*100 + 1858*100 + 1600*50 + 1549*50 + (n - 400)*2701;
      }else if(n>=301){
          pr = 2340*100 + 1858*100 + 1600*50 + 1549*50 + (n - 300)*2615;
      }
      else if(n>=201){
          pr = 1858*100 + 1600*50 + 1549*50 + (n - 200)*2340;
      }
      else if(n>=101){
          pr = 1600*50 + 1549*50 + (n - 100)*1858;
      }
      else if(n>=51){
          pr = 1549*50 + (n - 50)*1600;
      }
      else{
          pr = 1549*n;
      }
      printf("%d Kwh: %d VND", n, pr);
      return 0;
  }