- (IBAction)randomButton:(id)sender
{
int v = arc4random() %3;
if (v==1)
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"1" message:@"" delegate:nil cancelButtonTitle:@"Back" otherButtonTitles:nil];
    [alertView show];
}
if (v==2)
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"2" message:@"" delegate:nil cancelButtonTitle:@"Back" otherButtonTitles:nil];
    [alertView show];
}
if (v==3)
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"3" message:@"" delegate:nil cancelButtonTitle:@"Back" otherButtonTitles:nil];
    [alertView show];
}
}