1)

Program Pr1;
uses crt;
var x,i,n:integer;
begin
clrscr;
readln(n);
x:=1;
for i:=1 to n do x:=x*i;
writeln(x);
end.

2)

Program Pr1;
uses crt;
var x,y:real;
Begin
clrscr;
readln(x,y);
writeln(Exp(y*ln(x)));
end.

3)

Program Pr1;
uses crt;
var mas:array[byte] of integer;
i,n,c,b:integer;
Begin
clrscr;
writeln('Vvedite kol chisel');
readln(n);
c:=0;b:=1;
for i:=1 to n do begin
writeln('vvedite ',i,' chislo ');
readln(mas[i]);
end;
For i:=1 to n do if mas[i]<0 then c:=c+1
else b:=b*mas[i];
writeln('Chislo otrizateln. ',c,' Proizvedenie polojiteln ',b);
end.

4)

Program Pr1;
uses crt;
var x,y,i:integer;
Begin
clrscr;
readln(x);
y:=0;
for i:=100 to 999 do if i>x then begin
writeln(i);
y:=y+1;
end;
writeln('Vsego ',y);
end.