function [fib,lb,Ab] = kivioj(fi,l,A)
a=6378137;
e2=0.00669438002290;
s=25000;
A=66*pi/180;
fi=0.90805;
l=0.32100;
n=round(s/1000);
ds=s/n
for i=1:n
M(i)=a*(1-e2)/sqrt((1-e2*(sin(fi(i))^2))^3);
N(i)=a/sqrt(1-e2*(sin(fi(i)))^2);
dfi(i)=cos(A(i))*ds/M(i);
dA(i)=sin(A(i))*tan(fi(i))*ds/N(i);
fim(i)=fi(i)+(1/2)*dfi(i);
Am(i)=A(i)+(1/2)*dA(i);
Mm(i)=a*(1-e2)/sqrt((1-e2*(sin(fim(i))^2))^3);
Nm(i)=a/sqrt(1-e2*(sin(fim(i)))^2);
dfim(i)=ds*cos(Am(i))/Mm(i);
dlm(i)=ds*sin(Am(i))/Nm(i)*cos(fim(i));
dAm(i)=ds*sin(Am(i))*tan(fim(i))/Nm(i);
fi(i+1)=fi(i)+dfim(i);
l(i+1)=l(i)+dlm(i);
A(i+1)=A(i)+dAm(i);
end
fib=fi(n)
lb=l(n)
Ab=A(n)
end
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