function Main(input) {
    input = input.trim().split("\n");
    const [a, b, c, d] = input[0].trim().split(" ").map(Number);
    let p = 31 - a + b;
    let res;
    if (p >= c) res = 1;
    else if (p >= d) res = 2;
    else res = 3;
    console.log(res);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));