View Compilation Error

519768_0_0_24028\Main.java:1: 需要 "class" 或 "interface"
program Project2;
^
519768_0_0_24028\Main.java:2: 需要 "class" 或 "interface"
var
^
519768_0_0_24028\Main.java:4: 需要 "class" 或 "interface"
begin
^
519768_0_0_24028\Main.java:8: 需要 "class" 或 "interface"
      s:=0;
      ^
519768_0_0_24028\Main.java:9: 需要 "class" 或 "interface"
      for i:=1 to n do
      ^
519768_0_0_24028\Main.java:13: 需要 "class" 或 "interface"
      writeln(s);
      ^
519768_0_0_24028\Main.java:14: 需要 "class" 或 "interface"
      writeln;
      ^
519768_0_0_24028\Main.java:15: 需要 "class" 或 "interface"
    end;
    ^
519768_0_0_24028\Main.java:16: 需要 "class" 或 "interface"
end.
^
9 错误