window.onload=function()
{
 var black=document.querySelector('.black');
  var black2=document.querySelector('.black2');
  black.addEventListener('click',function()
  {
   black2.innerHTML=1*black2.innerHTML+1;
  })
 var red=document.querySelector('.red');
  var red2=document.querySelector('.red2');
  red.addEventListener('click',function()
  {
   red2.innerHTML=1*red2.innerHTML+1;
  })
 var green=document.querySelector('.green');
  var green2=document.querySelector('.green2');
  green.addEventListener('click',function()
  {
   green2.innerHTML=1*green2.innerHTML+1;
  }
)}