#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 {
        printf("200 USD");
    }
    else {
        printf("300 USD");
}
    return 0;
}