C++ - Simple Problems - Problem 3 - Code With Performance Issue

cpp-simple-problems-third-perf-issue

   int count = 0;

    for(int a = 0; a < 100; a++)
    {
       for(int b = 0; b < 100; b++)
       {
        for(int c = 0; c < 100; c++)
        {
        for(int d = 0; d < 100; d++)
         {
          if(a+b+c+d == 100) count++;
         }
        }
       }
    }

    cout << count;