#include<stdio.h>
int main() {
    float bmi;
    scanf("%f", %bmi);
    if (bmi < 0.0 || bmi > 100.0 ) {
        printf("Invalid input");
    }
    else if (bmi < 18.5) {
        printf("Underweight");
    }else if (bmi < 18.5 && bmi <= 24.9) {
        printf("Normal weight");
    }else if (bmi >= 25.0) {
        printf("Overweight");
    }
    return 0;
}