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