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