package contest190913; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Arrays; import java.util.InputMismatchException; public class E2 { InputStream is; PrintWriter out; String INPUT = ""; void solve() { // a, b // gcd(a, b) = 1 // sum (h-a)*(w-b)*2 // + (h-1)w + w(h-1) // sum_(a,b) 1 (gcd(a,b)=1) = long H = nl(), W = nl(); int mod = 1000000007; int[] lpf = enumLowestPrimeFactors(3000050); int[] mob = enumMobiusByLPF(3000050, lpf); long C = 0; long B = 0; long A = 0; long AB = 0; for(int i = 1;i <= H && i <= W;i++) { if(mob[i] == 0)continue; C += mob[i] * (H/i) * (W/i); // const B += mob[i] * (H/i) * s1(W/i, mod) % mod * i; A += mob[i] * (W/i) * s1(H/i, mod) % mod * i; AB += mob[i] * s1(H/i, mod) * s1(W/i, mod) % mod * i % mod * i; C %= mod; B %= mod; A %= mod; AB %= mod; } long ans= (AB-A*W-B*H+C*H%mod*W)*2+(H-1)*W+(W-1)*H; ans %= mod; if(ans < 0)ans += mod; out.println(ans); } public static long s1(long n, int mod) { return n*(n+1)/2 % mod; } public static int[] enumMobiusByLPF(int n, int[] lpf) { int[] mob = new int[n+1]; mob[1] = 1; for(int i = 2;i <= n;i++){ int j = i/lpf[i]; if(lpf[j] == lpf[i]){ // mob[i] = 0; }else{ mob[i] = -mob[j]; } } return mob; } public static int[] enumLowestPrimeFactors(int n) { int tot = 0; int[] lpf = new int[n + 1]; int u = n + 32; double lu = Math.log(u); int[] primes = new int[(int) (u / lu + u / lu / lu * 1.5)]; for (int i = 2; i <= n; i++) lpf[i] = i; for (int p = 2; p <= n; p++) { if (lpf[p] == p) primes[tot++] = p; int tmp; for (int i = 0; i < tot && primes[i] <= lpf[p] && (tmp = primes[i] * p) <= n; i++) { lpf[tmp] = primes[i]; } } return lpf; } void run() throws Exception { is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes()); out = new PrintWriter(System.out); long s = System.currentTimeMillis(); solve(); out.flush(); if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); // Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){ // @Override // public void run() { // long s = System.currentTimeMillis(); // solve(); // out.flush(); // if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); // } // }; // t.start(); // t.join(); } public static void main(String[] args) throws Exception { new E2().run(); } private byte[] inbuf = new byte[1024]; public int lenbuf = 0, ptrbuf = 0; private int readByte() { if(lenbuf == -1)throw new InputMismatchException(); if(ptrbuf >= lenbuf){ ptrbuf = 0; try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); } if(lenbuf <= 0)return -1; } return inbuf[ptrbuf++]; } private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); } private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; } private double nd() { return Double.parseDouble(ns()); } private char nc() { return (char)skip(); } private String ns() { int b = skip(); StringBuilder sb = new StringBuilder(); while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ') sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } private char[] ns(int n) { char[] buf = new char[n]; int b = skip(), p = 0; while(p < n && !(isSpaceChar(b))){ buf[p++] = (char)b; b = readByte(); } return n == p ? buf : Arrays.copyOf(buf, p); } private int[] na(int n) { int[] a = new int[n]; for(int i = 0;i < n;i++)a[i] = ni(); return a; } private long[] nal(int n) { long[] a = new long[n]; for(int i = 0;i < n;i++)a[i] = nl(); return a; } private char[][] nm(int n, int m) { char[][] map = new char[n][]; for(int i = 0;i < n;i++)map[i] = ns(m); return map; } private int[][] nmi(int n, int m) { int[][] map = new int[n][]; for(int i = 0;i < n;i++)map[i] = na(m); return map; } private int ni() { return (int)nl(); } private long nl() { long num = 0; int b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); } }