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