function Main(input) {
    let N = Number(input),
    	syou = Math.floor(N / 2),
    	str = (N % 2) ? "7" : "1"

    for (let i = syou - 1; i; i--) str += "1"

    console.log(Number(str))
}

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