#include <stdio.h>

int main() {
    float weight;
    
    print("Enter the package weight in kg: ");
    scanf("%f", &weight);
    
    if (weight < 1 || 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;
}