Hololens Voice Input Numbers on special word

I've some voice input commands and they are working well. But I want input some values with my voice like:

"Set Value Number"

Number = 4 or 7 or whatever

so that the number is not specific but variable what I say

keywords.Add("Set Value" + x, () => {
    // x is a Number like: 1,3,8,25
    this.BroadcastMessage("SetValue", x);
});