function y=prinos(x)
%y=prinos(x)

n=5;
c(1)=10000;
c(2)=15000;
c(3)=12000;
c(4)=15000;
c(5)=7000;
p=45095.03;
y=-p;
for i=1:n
   y=y+c(i)/(1+x)^i;
end
