import std.stdio, std.string, std.conv, std.algorithm;
import std.range, std.array, std.math, std.typecons, std.functional;

void main() {
    int n = readln.chomp.to!int;
    ten2seven(n).writeln;
}

long ten2seven(long n) {
    if (n == 0) return 0;

    long res = 0;
    int off = 0;

    while (n > 0) {
        res += 1L * n % 7 * 10L^^off;
        n /= 7L;
        off++;
    }

    return res;
}

unittest {
    assert(ten2seven(18) == 24);
    assert(ten2seven(7) == 10);
    assert(ten2seven(1000000000) == 33531600616);
}