#include<stdio.h>
int main()
{
    flaot weight;
    if(scanf("%f",&weight)!=1){
        printf("Invalid input");
        return 0;
    }
    if(weight<1||weight>50){
        printf("Invalid input");
        return 0;
    }
    if(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;
}