Calculate the square root only using ++
Python 66

print'%.0f'%reduce(lambda a,b:abs(a)+1e10j,range(-2,input())).real


Output

&gt;&gt;&gt; print'%.0f'%reduce(lambda a,b:abs(a)+1e10j,range(-2,input())).real
121
110000000000
&gt;&gt;&gt; print'%.0f'%reduce(lambda a,b:abs(a)+1e10j,range(-2,input())).real
1000
316227766017



   This solution uses Spiral of Theodorus on a complex plane to achieve the result.