import std.conv, std.functional, std.range, std.stdio, std.string; import std.algorithm, std.array, std.bigint, std.complex, std.container, std.math, std.numeric, 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(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; } int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); } int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); } int N; int[] A; int M; int[] B; void main() { try { for (; ; ) { N = readInt(); A = new int[N]; foreach (i; 0 .. N) { A[i] = readInt(); } M = readInt(); B = new int[M]; foreach (j; 0 .. M) { B[j] = readInt(); } auto ASum = new int[1 << N]; foreach (i; 0 .. N) { foreach (h; 0 .. 1 << i) { ASum[h | 1 << i] = ASum[h] + A[i]; } } auto dp = new int[1 << N]; dp[] = M + 1; dp[0] = 0; foreach (j; 0 .. M) { foreach_reverse (h; 0 .. 1 << N) { for (int g = h; g; --g &= h) { if (ASum[g] <= B[j]) { chmin(dp[h], dp[h ^ g] + 1); } } } } const ans = dp[$ - 1]; writeln((ans >= M + 1) ? -1 : ans); } } catch (EOFException e) { } }