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  1. program ideone;
  2. var n, f, i: integer;
  3. begin
  4. f:= 1;
  5. readln (n);
  6. for i:= 2 to n do
  7. f:= f * i;
  8. writeln (f);
  9. end.
Success #stdin #stdout 0s 9128KB
stdin
1
stdout
1