#include <Servo.h>

Servo servo1;
Servo servo2;

int pin1 = 9;
int pin2 = 10;
int i, j, k;

//------------Only change this portion of code------------------
int maximum_angle = 180; // maximum angular displacement
float angle_increment = 30; // setting up angle increment
float time_delay = 100;
//--------------------------------------------------------------

void setup() 
{
  pinMode(pin1, OUTPUT);
  pinMode(pin2, OUTPUT);
  servo1.attach(pin1);
  servo2.attach(pin2);

  for(k=1; k<=10; k++)
  {
    for(i=0; i<=maximum_angle; i=i+angle_increment)
    {
    servo1.write(i);
    servo2.write(i);
    delay(time_delay);
    }

    for(j=maximum_angle; j>=0; j=j-angle_increment)
    {
    servo1.write(j);
    servo2.write(j);
    delay(time_delay);
    }
  }

  digitalWrite(pin1, LOW);
  digitalWrite(pin2, LOW);
}

void loop() 
{
  //
}