#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");
    }else if(weight<=5){
        printf("100 USD");
    }else if(weight>5 && weight<=20){
        printf("200 USD");
    }else if(
        printf("300 USD");
    }
    return 0;
    }