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

void main() {
    const tmp = readln.split.to!(long[]);
    writeln(tmp[0] < tmp[2] && tmp[2] < tmp[1] || tmp[0] > tmp[2] && tmp[2] > tmp[1] ? "Yes" : "No");
}

