#include<stdio.h>
int main(){
    int age;
    
    printf("Enter the age:");
    scanf("%d",&age);
    if (age<0)
    {
        printf("Invalid input");
    }
     else if (age>=18)
    {
        printf("Eligible \n");
    }
    else:
    {
        printf("Not eligible \n");
    }
    return 0;
}