#include<stdio.h>
int main(){
    float weight;
    
    
    if (scanf("%f",&weight) !=1){
        printf("Invalid input");
        return 0;
    }
    if (weight < 1 || weight > 50){
        printf("Invalid input");
        return 0;
    }
    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;
}