import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, 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)); }


enum LIM = 10^^6 + 10;

void main() {
  auto lpf = iota(LIM).array;
  foreach (p; 2 .. LIM) {
    if (lpf[p] == p) {
      for (int n = 2 * p; n < LIM; n += p) {
        chmin(lpf[n], p);
      }
    }
  }
  auto fs = new long[LIM];
  fs[1] = 1;
  foreach (n; 2 .. LIM) {
    const p = lpf[n];
    int e;
    int nn = n;
    do {
      ++e;
      nn /= p;
    } while (nn % p == 0);
    if (nn == 1) {
      fs[n] = 1L * n / p * (1L * (p - 1) * e + p);
    } else {
      fs[n] = fs[n / nn] * fs[nn];
    }
  }
  debug {
    writeln("fs = ", fs[0 .. 31]);
  }
  
  try {
    for (; ; ) {
      const N = readInt();
      const M = readInt();
      auto A = new int[M];
      foreach (i; 0 .. M) {
        A[i] = readInt();
      }
      
      long ans;
      foreach (i; 0 .. M) {
        ans += fs[A[i]] - A[i];
      }
      writeln(ans);
    }
  } catch (EOFException e) {
  }
}