calculate playerprefs and display

Ok so i have multiple playerprefs, what i would like to do is add up all the values in my playerprefs and display the final value

i was thinking something like this:

function Update () {

guiText.text = (PlayerPrefs.GetInt(“Level81Score”+“Level15Score”+“Level15Score”)).ToString ();

}

Just use GetInt for each entry. You can’t combine the strings like that.