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