Вот, смотри структуру информатики:
Program lol (input, output);
var a, n, b, p,s, m:integer;
c:real;
begin
read (n);
a:=n;
b:=0;
c:=0;
p:=1;
while a <> 0 do
begin
a:=a div 10;
b:=b+1;
end;
while b <> 0 do
begin
p:=1;
for m:=1 to b do
p:=p*10;
s:=(n mod p) div (p div 10);
if s > 7 then
c:=c+s;
b:=b-1;
end;
writeln (c);
end.
Var
x, y, z, a, b: real;
begin
readln(x, y, z);
a := x * x * x * sqr(Tan(sqr(x + y))) + z / sqrt(x + z);
b := (y * x * x - z) / (exp(z * x) - 1);
writeln('a=', a);
writeln('b=', b);
end.
Var
c: integer;
begin
readln(c);
writeln(sqr(c mod 10));
end.