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