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