clc;
clear all;
close all;

format long e;

x=1:1:10^6;

tic;
y=0;
for i=1:length(x)
    y = y +x(i);
end
disp(y);
toc;

tic;
y1 = sum(x);
disp(y1);
toc;

tic;
n = length(x);
S = x(1);
C=0;
for i=2:n
    Y=x(i) - C;
    T = S+Y;
    C = (T-S)-Y;
    S = T;
end
disp(S);
toc;

tic;
S1 = 0;
U = 0;
P = 0;
for i=1:n
   S1=U+x(i);
   P=U-S1+x(i)+P;
   U=S1;
end
S1=S1+P;
disp(S1);
toc;