int factorial(int i){
    if(i==1 || i==0){
        return 1;
    }
    else{
        return(i*factorial(i-1));
    }
}

int main(){
    int num;
    printf("enter the number\n");
    scanf("%d",&num);
    printf("the factorial of %d is %d\n",num,factorial(num));
    
    return 0;
}