#include <stdio.h>

struct weight 
{
    float n;
};
int main ()
{
    struct weight bmi; 
    scanf("%d",&bmi.n);
    if(bmi.n<18.5)
    {
        printf("Underweight");
    }
    else if(18.5<25)
    {
        printf("Normal weight");
    }
    else
    {
       printf("Overweight");
    }
    return 0;
}