#include<stdio.h>
int main()
{
    float weight;
    if(scanf("%f",&weight)!=1);
    printf("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 USD");
}
return 0;
}