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