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