#include<stdio.h>
struct weight;{
    float a;
}
int main(){
    struct weight s1;
    scanf("%f",s1);
    if(a<18.5){
        printf("Underweight");
    }
    else if(a>=18.5 || a<=24.9){
        printf("Normal weight");
    }
    else{
        printf("Overweight");
    }
    return 0;
}