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