Calculated Characteristics

I am using calculated MIC with a formula having more than 150 characteristics. But calculated formula field in Inspn plan in limited to 6o characteris in Formula 1. How can I put this lengthy formula to arrive at my calculated MIC.

Formula is like mentioned below.

((c0020(47)/2+(c0030(42)/2(c0040*(38)/2(c0050(30)/2+(C0060(22)/2(C0070*(15)/2(C0080(9)/2+(C0090(7)/2C0100*(5)/2(c0110(3)/2+(C0120(2)/2)/100)

Please let me know, how can I go ahead with this calculation.

Thanks

Jason