// editor5
#include<stdio.h>
int main()
{
    float weight;
    
    if(scanf("%f",&weigth)!=1)
    {
        printf("Invalid iput");
        return 0;
    }
    if(weight<1||weight>50)
    {
        printf("Invalid input");
    }
    else(weight>=3)
    {
        printf("100 USD");
    }
    else(weigth<=20)
    {
        printf("200 USD");
    }
    else(weight>=30)
    {
        printf("300 USD");
    }
    return 0;
    
}