#include<stdio.h>
int main()
{
    float bml;
    scanf("%f", &bml);
    if (bml < 0.0 || bml > 100.0){
        printf("Invalid input");
    }
    else if (bml < 18.5)(
        printf("underweight");
        )else if (bml >= 18.5 && bml <= 24.9) (
            printf("normalweight");
        )else if (bml >= 25.0) {
            printf("overweight");
        }    
        return 0;
}