N=-1520*(3.12*((((0.1*S-3.9)/0.988)^7.45+1)^(-(0.1*S-3.9)/3.37))^3.12*(-(7.45*(0.1*S-3.9)*((0.1*S-3.9)/0.988)^(7.45-1))/(0.988*3.37*(((0.1*S-3.9)/0.988)^7.45+1))-ln(((0.1*S-3.9)/0.988)^7.45+1)/3.37))

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