#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>5&&weight=20){
       printf("200 USD");
   }
   else{
       print("300 USD");
   }
}