3
f1(a,b)=475b+(951a+747a)
f2(a)=535a+728a+825a*(878a*322a)
f3(a,b,c)=981a-(724a+471c-228b-123c+9c+880c-461*374c*244b)*849c*395a-135c-915a+a-155-606c-875b
f2(711)-773*f1(111,475)*f1(311,553)-(f2(140)*f1(301,810)*f3(676,457,569)*f3(198,913,865))*(f2(454)+f1(929,566))
