uses crt;
const fi='baitap.pas';
var f1:text;
a,b,c,d,h:integer;
begin
clrscr;
assign(f1,fi); reset(f1);
readln(f1,a,b,c,d);
h:=a-b-c-d;
writeln(h);
close(f1);
readln;
end.
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