program r;
     uses crt;
     var a,b,s,ss,dx,x,p1,p2,p3,p4,p5,p:real;
     i,n,m:integer;
     begin
     clrscr;
     write ('a=');
     readln (a);
     write ('b=');
     readln (b);
     write ('m>0, m=');
     readln (m);
     if a<b then dx:=(b-a)/m else dx:=(a-b)/m;
     x:=a;
     ss:=0;
     write ('n=0,1,2,3,...., n=');
     readln (n);
     if n=0 then for i:=1 to m do ss:=ss+exp(a*x)/a
            else if n=1 then for i:=1 to m do begin
                                              p1:=exp(a*x);
                                              p2:=a*sin(b*x);
                                              p3:=b*cos(b*x);
                                              ss:=ss+p1*(p2-p3)/(a*a+sqr(n*b))
                                              end
                        else while n>=1 do begin
                               p4:=n*(n-1)*b*b/(a*a+sqr(n*b));
                               s:=0;
                               for i:=1 to m do begin
                                                p1:=exp(a*x);
                                                p2:=a*sin(b*x);
                                                p3:=b*cos(b*x);
                                                p5:=exp((n-1)*ln(sin(b*x)));
                                                s:=s+p1*p5*(p2-p3)/(a*a+sqr(n*b));
                                                end;
                               ss:=ss+n*(n-1)*b*b*s/(a*a+sqr(n*b));
                               n:=n-2;
                               end;
     writeln ('int=',ss*dx:0:5);
     readln;
     end.