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