#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';
}