Var
 nom1,nom2,denom1,denom2:Word;
 nom3,denom3,d,min,max:LongInt;
 i,j,p:Byte;
 Code:Integer;
 S,S1,S2:String;
Begin
 Writeln('First fraction (n/d, e.g. 67/458):');
 Readln(S);
 i:=0;
 S1:='';
 S2:='';
 Repeat
  Inc(i);
  If S[i]<>'/' then S1:=S1+S[i];
 Until S[i]='/';
 Val(S1,nom1,Code);
 For j:=i+1 to Length(S) do S2:=S2+S[j];
 Val(S2,denom1,Code);
 Writeln('Second fraction:');
 Readln(S);
 i:=0;
 S1:='';
 S2:='';
 Repeat
  Inc(i);
  If S[i]<>'/' then S1:=S1+S[i];
 Until S[i]='/';
 Val(S1,nom2,Code);
 For j:=i+1 to Length(S) do S2:=S2+S[j];
 Val(S2,denom2,Code);
 denom3:=denom1*denom2;
 nom3:=nom1*denom2+nom2*denom1;
 If nom3<=denom3 then
  begin
   p:=1;
   min:=nom3;
   max:=denom3;
  end
 else
  begin
   p:=2;
   min:=denom3;
   max:=nom3;
  end;
 For d:=(min div 2) downto 2 do
  If ((min mod d)=0) and ((max mod d)=0) then
   begin
    min:=min div d;
    max:=max div d;
   end;
 Writeln('Result:');
 If p=1 then Writeln(min,'/',max) else Writeln(max,'/',min);
 Readln;
End.

Const
 N=20;
Var
 A,B:Array[1..N] of Byte;
 i,j:Byte;
Begin
 Randomize;
 Writeln('Initial array:');
 For i:=1 to N do
  begin
   A[i]:=Random(2*N);
   Write(A[i]:4);
  end;
 Writeln;
 j:=0;
 Writeln('New array:');
 For i:=1 to N do
  If A[i]<=i then
   begin
    Inc(j);
    B[j]:=A[i];
   end;
 For i:=1 to j do Write(B[i]:4);
 Readln
End.

Var
 a,Sum,q:real;
 n,i:byte;
Begin
 Write('a= ');
 Readln(a);
 Write('n(>1)= ');
 Readln(n);
 Sum:=1;
 q:=1;
 For i:=2 to n do
  begin
   q:=q*Sqr(a);
   Sum:=Sum+Sin(a*(2*i-2))/q;
  end;
 Writeln('Sum= ',Sum:0:5);
 Readln
End.

Var
 a,S:real;
 n:Byte;

Function Pow(b:real;m:Byte):Real;
begin
 If m>1 then Pow:=b*Pow(b,m-1) else Pow:=b;
end;

Function Sum(k:Byte):Real;
begin
 If k>1 then Sum:=Sin(a*(2*k-2))/Pow(a,(2*k-2))+Sum(k-1) else Sum:=0;
end;

Begin
 Write('a= ');
 Readln(a);
 Write('n(>1, <5)= ');
 Readln(n);
 S:=1+Sum(n);
 Writeln('Sum= ',S:0:5);
 Readln
End.