#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(wheight<=5){
        printf("100 USD");
        return 0;
    }
    else if(weight<=20){
        printf("200 USD");
        return 0;
    }
    else{
        printf("300 USD");
    }
    return 0;
    
}