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