#include<stdio.h>
int main() {
    float bmi;
    scanf("%f",&bmi);
    if(bmi < 18.5){
        print("Underweight\n");
    }else if(bmi >= 18.5 && bmi <= 24.9){
        printf("Normal weight\n");
    }else if(bmi >= 25){
        printf("Overweight\n");
    }
    return 0;
}