#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&&weigh<=20)
    {
        printf("200 USD");
    }
    else{
        printf("300USD")
    }
}