##Python 2, 118 bytes (120 - 2)
a,b=0,1;print a
with open(__file__,'r+')as f:s=f.read();s=s.replace(s[4:s.find(';')],`b`+','+`a+b`);f.seek(0);f.write(s)
Gurupad Mamadapur
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