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