#include <stdio.h>
int main(){
    float bim;
    scanf("%f",&bim);
    if(bmi < 18.5){
        printf("underweight\n");
    }else if(bmi >= 18.5 && bmi <= 24.9){
        printf("Normal weight\n");
    }else if( bmi >= 25){
        printf("Overweight\n");
    }
    retutn 0;
}