program determinant_4;
uses crt;
var
a11,a12,a13,a14,a21,a22,a23,a24,a31,a32,a33,a34,a41,a42,a43,a44,x:real;
begin textcolor(white); textbackground(blue); clrscr;
writeln(' ABROR TOJIBOYEV');
write('a11=');read(a11); write('a12=');read(a12);write('a13=');read(a13); write('a14=');read(a14);
write('a21=');read(a21);write('a22=');read(a22); write('a23=');read(a23); write('a24=');read(a24);
write('a31=');read(a31); write('a32=');read(a32); write('a33=');read(a33); write('a34=');read(a34);
write('a41=');read(a41); write('a42=');read(a42); write('a43=');read(a43); write('a44=');read(a44);
x:=((a11*((a22*a33*a44)+(a23*a34*a42)+(a32*a43*a24)-(a42*a33*a24)-(a43*a34*a22)-(a23*a32*a44)))
-(a12*((a21*a33*a44)+(a23*a34*a41)+(a31*a43*a24)-(a41*a33*a24)-(a43*a34*a21)-(a31*a23*a44)))
+(a13*((a21*a32*a44)+(a22*a34*a41)+(a31*a42*a24)-(a41*a32*a24)-(a42*a34*a21)-(a31*a22*a44)))
-(a14*((a21*a32*a43)+(a22*a33*a41)+(a31*a42*a23)-(a41*a32*a23)-(a42*a33*a21)-(a31*a22*a43))));
 
writeln('determinant=',x:8:6);
readln;
end.