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