#include<stdio.h>
imt 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;
}