Program icecubes;
const
    MAXN = 100000;
 
var
    N, ans, i, count : LongInt;
    C         : Array[0..MAXN-1] of LongInt;
 
begin
    (*assign(input,  'input.txt');  reset(input);
    assign(output, 'output.txt'); rewrite(output);*)
 
    ReadLn(N);
 
    count:=0;  ans :=0;
 
    for i:=0 to N-1 do
                 begin
                    Read(C[i]);
                    if C[i]<>0 then begin count:=count+1; ans:=ans+C[i]; end;
                 end;   
    ReadLn();
 
    ans:=ans-count;
 
    WriteLn(ans);
 
end.
 

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