const fi='data.txt';

fo='tbc.txt';

var f1,f2:text;

a:array[1..100]of integer;

n,i,t:integer;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

n:=0;

while not eof(f1) do 

  begin

n:=n+1;

readln(f1,a[n]);

end;

t:=0;

for i:=1 to n do 

  t:=t+a[i];

writeln(f2,t/n:4:2);

close(f1);

close(f2);

end.

uses crt;

const fi='so.inp';

var f1:text;

a,b:integer;

begin

clrscr;

assign(f1,fi); reset(f1);

while not eof(f1) do 

 begin

readln(f1,a,b);

writeln((a+b)/2:4:2);

end;

close(f1);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

long long a,b;

double tb;

int main()

{

freopen("dulieu.inp","r",stdin);

freopen("ketqua.out","w",stdout);

cin>>a>>b;

cout<<a<<" "<<b;

cout<<fixed<<setprecision(2)<<(a*1.0+b*1.0)/(2*1.0);

return 0;

}

Uses crt;
var f1,f2:text;
    i,n,tong,tongchan,dem:integer;
    tb:real;
Begin
 clrscr;
 Assign(f1,'DAYSO.txt');
 Assign(f2,'KETQUA.txt');
 reset(f1);dem:=0;tong:=0;tongchan:=0;
 While Not EOF(f1) do
  Begin
  read(f1,i);
  inc(tong,i);
  If i mod 2 = 0 then
    begin
    inc(dem);
    inc(tongchan,i);
    end;
  End;
 tb:=tongchan/dem;
 close(f1);
 rewrite(f2);
 writeln(f2,tong);
 writeln(f2,tongchan);
 writeln(f2,tb:0:2);
 close(f2);
 write(tong);
 readln;
End.

const fi='songuyen.inp';

fo='tong.out';

var f1,f2:text;

a:array[1..100]of integer;

i,n,t:integer;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

n:=0;

while not eoln(f1) do 

  begin

n:=n+1;

read(f1,a[n]);

end;

t:=0;

for i:=1 to n do 

  if a[i] mod 2=0 then t:=t+a[i];

writeln(f2,t);

close(f1);

close(f2);

end.

const fi='data.inp';
fo='result.txt';
var f1,f2:text;
a:array[0..100]of integer;
dem,i,t:integer;
tbc:real;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
dem:=0;
while not eoln(f1) do
begin
inc(dem);
readln(f1,a[dem]);
end;
{---------------------------------xu-ly--------------------------------}
t:=0;
for i:=1 to dem do
t:=t+a[i];
tbc:=t/dem;
writeln(f2,tbc:4:2);
close(f1);
close(f2);
end.

const fi='sn.inp';

fo='sn.out';

var f1,f2:text;

a,b:integer;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

readln(f1,a,b);

writeln(f2,a-b);

close(f1);

close(f2);

end.