#include<stdio.h>
int main(){
    float weight;
    if (scanf("%f",&weight) !=1){
        print("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;
    
}