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