program tinhtong;
uses crt;
var A:array[1..100] of integer;
n,i,j:integer;
gt,s:int64;
begin
clrscr;
write('Nhap so luong phan tu n: '); readln(n);
s:=0;
for i:=1 to n do
begin
write('A[',i,']= '); readln(A[i]);
gt:=1;
for j:=1 to i do gt:=gt*A[i];
S:=S+gt;
end;
write('Tong la: ',s);
readln;
end.