#include<stdio.h>
int main()
{
  float weight;
  scanf("%f",&weight);
  if(weight<1||weight>50)
  {
  printf("Invalid input");
  }
 else if(weight<=5)
 {
     printf("100 USD");
 }
 else if(weight<=20);
 {
     printf("200 USD");
     
 }
 else{
     printf("300 USD");
 }
 return 0;
 }