how to Addition with a number all column in php array

hi i have a json like this :

    "telegram": {
        "russia": {
            "price": "5000",
            "count": "✅ 7",
            "prefix": "+7"
        },"usa": {
            "price": "7000",
            "count": "✅ 9",
            "prefix": "+1"
        },
    },"google": {
        "russia": {
            "price": "5500",
            "count": "✅ 11",
            "prefix": "+7"
        },"usa": {
            "price": "7700",
            "count": "✅ 20",
            "prefix": "+1"
        },
    }

And I want to add all the available prices to a number like 200
how i can do it?