#include<stdio.h>
int main()
{
    float weight;
    scanf("%f",&weight);
    if(weight<1 || weight>50)
    {
        printf("Invalid input");
        return 0;
    }
    if(weight<=5)
    {
        printf("100 USD");
        retutn 0;
    }
    else if(weight>=6 && weight<=20)
    {
        printf("200 USD");
    }
    else 
    {
        printf("300 USD");
    }
return 0;
}