#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
    printf("300 USD");
    return 0;
}