Program Zadacha;
uses crt;
var t,v1,v2,s,r:integer;
begin clrscr;
writeln('skorost 1-go avto := ');
readln(v1);
writeln('skorost 2-go avto:= ');
readln(v2);
writeln('rastoyanie:= ');
readln(s);
writeln('vremya:= ');
readln(t);
r:=s-((t*v1)+(t*v2));
writeln('Otvet: ');
writeln(abs(r));
readkey;
end.