30points
what’s the best way to add devices to a computer system? ​

program xxx;

  var n, c, d, e, s : integer;

begin

    write('введите число');

    readln(n);

    c: = n div 100;

    d: =(n div 10) mod 10;

    e: = n mod 10;

    s: = c + d + e;

    writeln('сумма чисел =', s);

    readln

end.

# include < stdio.h> int phi(int x){int i,k=0; if(x> 1)k+=phi(x-1)+phi(x-2); if(x< 2)k=x; return k; }      int main (void){int x; scanf("%d",& x); printf("%d",phi(x)); return 0; }

var i,s: integer;

begin

writeln('summa ');

for i: =100 to 999 do

if i mod 17 =0 then s: =s+i else s: =s+0;

writeln(s)

end.

program ssd;

  uses crt,graph;

  var   a,a1,a2,a3: integer;

  begin

  clrscr;

  writeln('введите трехзначное число');

  readln(a);

  a1: = a mod 10;

  a2: =(a div 10) mod 10;

  a3: = a div 100;

  writeln('      ',a1,a2,a3);

  readkey;

end.