#include <stdio.h>

void checkBMI (float bmi){
    if(bmi < 18.5)
        printf("Underweight");
    else if(bmi>25)
        printf("Overweight");
    else
        printf("Normal weight");
};

int main() {
    float bmi;
    scanf("%d", &bmi);
    checkBMI(float bmi);
}