#include<stdio.h>
int main(){
    int packages;
    scanf("%d",packages);
    if(packages>5){
        printf("100 USD");
    }else if(packages<=5 && packages>20){
        printf("200 USD");
    }else if(packages<=20 && packages>50){
        printf("300 USD");
    }else {
        printf("Invalid input");
    }
    return 0;
}