uses crt;

var x,n,i,t:integer;

begin

clrscr;

readln(n);

t:=0;

for i:=1 to n do 

begin

readln(x);

if x mod 2=0 then t:=t+x;

end;

writeln(t);

readln;

end.

program ideone;
var i,n,x,res:longint;
begin
readln(n);
res:=0;
for i:=1 to n do 
begin
read(x);
if x mod 2 = 0 then
res:=res+x;
end;
write(res);

end.

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

i,n:integer;

s:longint;

Begin

Write('n = ');readln(n);

For i:=1 to n do

Begin

Write('Nhap phan tu thu ',i,' = ');readln(a[i]);

s:=s+a[i];

End;

Write('Cac phan tu vua nhap la ');

For i:=1 to n do

Write(a[i]:8);

Writeln;

Write('Tong cua chung la ',s);

Readln

End.

#include <bits/stdc++.h>

using namespace std;

long long a[1000],i,n,t,dem;

int main()

{

cin>>n;

for (i=1; i<=n; i++) cin>>a[i];

t=0;

dem=0;

for (i=1; i<=n; i++)

if ((a[i]>0) and (i%2==1))

{

t+=a[i];

dem++;

}

cout<<fixed<<setprecision(2)<<(t*1.0)/(dem*1.0);

return 0;

}

program du_lieu;

uses crt;

var i,n:integer;

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

tbc:real;

f:text;

begin

clrscr;

assign(f,'DULIEU.INP');reset(f);

readln(f,n);

for i:=1 to n do

begin

read(f,a[i]);

end;

close(f);

for i:=1 to n do

tbc:=tbc+a[i];

writeln(tbc/n);

readln;

end.

program Tinhtong;

uses crt;

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

sum,n:integer;

begin clrscr;

write('Nhap n = '); readln(n);

for i:=1 to n do

begin

write('a[',i,'] = '); readln(a[i]);

end;

sum:=0;

for i:=1 to n do

if (a[i] mod 2 = 0) then sum:=sum+a[i];

write('Tong cac so chan = ',sum);

readln;

end.

uses crt;

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

i,n,tc,tl,t:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

tc:=0;

tl:=0;

for i:=1 to n do 

  begin

if a[i] mod 2=0 then tc:=tc+a[i]

else tl:=tl+a[i];

end;

writeln('Tong cac so chan la: ',tc);

writeln('Tong cac so le la: ',tl);

t:=0;

for i:=1 to n do  

t:=t+a[i];

writeln('Tong cua day so la: ',t);

readln;

end. 

uses crt;

var a:array[1..1000]of integer;

i,n,dem1,dem2,t1,dem3,j,kt:integer;

begin

clrscr;

readln(n);

for i:=1 to n do 

  readln(a[i]);

dem1:=0;

dem2:=0;

t1:=0;

for i:=1 to n do 

  begin

if a[i] mod 2=0 then 

begin

dem1:=dem1+1;

t1:=t1+a[i];

end;

else dem2:=dem2+1;

end;

dem3:=0;

for i:=1 to n do 

  if (a[i]>1) then 

begin

kt:=0;

for j:=2 to trunc(sqrt(a[i])) do 

  if a[i] mod j=0 then kt:=1;

if kt=0 then dem3:=dem3+1;

end;

writeln(dem1, ' ',dem2);

writeln(t1);

writeln(dem3);

readln;

end.

Bài 1:

Uses crt;

var i,n,j:integer;

     a,b,c:array[1..100000] of integer;

Begin

clrscr;

readln(n);

for i:= 1 to n do readln(a[i]);

for i:= 1 to n do readln(b[i]);

j:=0;

for i:= 1 to n do 

  Begin

  inc(j);

  c[j] := a[i];

  inc(j);

  c[j] := b[i];

  end;

for i:= 1 to j do write(c[i],'  ');

readln;

end.