import std.conv, std.stdio, std.string; import std.algorithm, std.array, std.bigint, std.container, std.math, std.numeric, std.range, std.regex, std.typecons; import core.bitop; class EOFException : Throwable { this() { super("EOF"); } } string[] tokens; string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; } int readInt() { return readToken.to!int; } long readLong() { return readToken.to!long; } real readReal() { return readToken.to!real; } bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } } bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } } int binarySearch(T)(in T[] as, in bool delegate(T) test) { int low = -1, upp = cast(int)(as.length); for (; low + 1 < upp; ) { int mid = (low + upp) >> 1; (test(as[mid]) ? low : upp) = mid; } return upp; } int lowerBound(T)(in T[] as, in T val) { return as.binarySearch((T a) => (a < val)); } int upperBound(T)(in T[] as, in T val) { return as.binarySearch((T a) => (a <= val)); } enum LIM = 10^^5; bool[] isnp; int[] primes; void prepare() { isnp = new bool[LIM]; foreach (i; 2 .. LIM) { if (!isnp[i]) { primes ~= i; for (int j = 2 * i; j < LIM; j += i) { isnp[j] = true; } } } } void main() { prepare(); try { for (; ; ) { const L = readLong(); const H = readLong(); long ans; foreach_reverse (i, p; primes) { for (long n = H / p * p; n >= L && n >= p^^2; n -= p) { bool ok = true; foreach (j, q; primes[0 .. i]) { if (n % q == 0) { ok = false; break; } } if (ok) { ans = n; goto found; } } } found: writeln(ans); } } catch (EOFException e) { } }