\(14*13=182\)
\(182*12=2184\)
\(2184*11=24024\)
\(24024*10=240240\)
\(240240*9=2162160\)
\(2162160*8=17297280\)
\(17297280*7=121080960\)
\(121080960*6=726485760\)
\(726485760*5=3632428800\)
\(3632428800*4=14529715200\)
\(14529715200*3=43589145600\)
\(43589145600*2=87178291200\)
\(87178291200*1=87178291200\)
a=7 b=9 c=0 d=0