function Main(input) {
    const src = input.replace("\n", "").split(" ");
    const a = parseInt(src[0]);
    const b = parseInt(src[1]);
    const c = parseInt(src[2]);
    const d = parseInt(src[3]);
    const m = parseInt(src[4]);
    let ans = 0;
    for (let i = a; i <= b; i++) {
        for (let j = c; j <= d; j++) {
            ans = Math.max(ans, ((i + j) % m));
        }
    }
    console.log(ans);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));