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