#include<stdio.h>
struct BMI
{
    float bmi;
};
void main1(struct BMI b)
{
    if(b.bmi<18.5)
        printf("Underweight\n");
    else if(b.bmi>=18.5 && b.bmi<=24.9)
        printf("Normal weight\n");
    else if(b.bmi>=25)
        printf("Overweight\n");
}
int main()
{
    struct BMI BMI;
    scanf("%f",&BMI.bmi);
    main1(BMI);
return 0;
}