import std.stdio, std.array, std.string, std.conv, std.algorithm; import std.typecons, std.range, std.random, std.math, std.container; import std.numeric, std.bigint, core.bitop; void main() { auto N = readln.chomp.to!int; auto A = readln.split.map!(x => x.to!int-1).array; auto cnt = N.iota.map!(i => i == A[i]).sum; writeln( N - cnt == 2 ? "No" : "Yes" ); }