1988x1996+1997x1997+1985
=(1985+3)x1996+(1996+1)x1997+1985
=1985x1996+3x1996+1996x1997+1997+1985
=(1985+1)x1996+1996x1997+3x1996+1997
=1986x1996+1996x1997+3x1996+1997
=1986x1996+3x1996+1996x1997+1997
=(1986+3)x1996+(1996+1)x1997
=1989x1996+1997x1997
=3970044+3988009
=7958053