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