#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 <= 20)
    {
        printf("200 USD");
    }
    else if (Weight <= 300)
        printf("300 USD");
}
    return 0;
}