#include <stdio.h>

int main(){
    if(scanf("%f",&bmi)!=1||bmi<0.0||bmi>100.0){
        printf("Invalid input\n");
        return 0;
    }
    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;
}