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