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