program mwt;
Type c=array[0..2002] of longint;
Var n,m,i,j:longint;
    a,b:c;
    f:array[0..2002,0..2002] of longint;

Function min(x,y:longint):longint;
  begin
    if x<y then min:=x
           else min:=y;
  end;

Procedure sort(p,q:longint; var a:c);
  var l,r,o,x:longint;
    begin
      l:=p; r:=q;
      o:=a[l+random(r-l+1)];
      repeat
        while a[l]>o do inc(l);
        while o>a[r] do dec(r);
        if l<=r then begin
          x:=a[l];
          a[l]:=a[r];
          a[r]:=x;
          inc(l); dec(r);
        end;
      until l>r;
      if p<r then sort(p,r,a);
      if l<q then sort(l,q,a);
    end;

Begin
 assign(input,'cut.in');   
    reset(input);   
    assign(output,'cut.out');   
    rewrite(output);      
 readln(n,m);
  for i:=1 to n-1 do read(a[i]); readln;
  for i:=1 to m-1 do read(b[i]); readln;
  randomize;
  sort(1,n-1,a);
  sort(1,m-1,b);
  for i:=1 to n-1 do f[i,0]:=f[i-1,0]+a[i];
  for i:=1 to m-1 do f[0,i]:=f[0,i-1]+b[i];
  for i:=1 to n-1 do
    for j:=1 to m-1 do
      f[i,j]:=min(f[i-1,j]+a[i]*(j+1),f[i,j-1]+b[j]*(i+1));
  writeln(f[n-1,m-1]);
End.