print((function (f, g)
	local a,b,m = g()
	return tostring(m==0 and a or m==1 and b or f(a,b)):sub(1,-3)
end)((function (ffi)
	ffi.cdef 'int scanf(const char *, ...);'
	local C,typeof,bxor = ffi.C,ffi.typeof,bit.bxor
	local p,u = typeof("int64_t[1]"),typeof("union { int64_t n64; int32_t n32[2]; }")
	local a,b,c = p(),p(),p()
	function bxor64(_a, _b, ...)
		-- https://github.com/justincormack/ljsyscall/blob/master/syscall/bit.lua
		local a,b,r = u(_a),u(_b),u()
		r.n32[0],r.n32[1] = bxor(a.n32[0],b.n32[0]),bxor(a.n32[1],b.n32[1])
		if select("#",...)>0 then return bxor64(r.n64, ...) end
		return r.n64
	end
	return bxor64, function () C.scanf("%ld%ld%ld",a,b,c) return a[0],b[0],c[0]%3 end
end)(require'ffi')))