function Main(input) {
    var line = input.split("\n");
    var X = +line[0];
    var Y = +line[1];
    var L = +line[2];
    var count = 0;

    if (X != 0) {
        count += 2;
        if (Y != 0) {
            count += 2;
        }
    }
    count += (Y < 0) ? 3 :
             (Y > 0) ? 1 :
                       0;
    console.log(count);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));