#include<stdio.h>
int main (){
    float weight;
    if(scanf("%d",&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;
}