# include <stdio.h>
# include <math.h>

int main(void)
{
  int i,fi,j,fj,n;
  long double A1,A2,B1,B2,a1,a2,r1,r2;
  scanf("%d%d%d%d",&i,&fi,&j,&fj);
  r1=(1+sqrt(5))/2;
  r2=(1-sqrt(5))/2;
  A1=powl(r1,i);
  A2=powl(r1,j);
  B1=powl(r2,i);
  B2=powl(r2,j);
  a1=(B1*fj-B2*fi)/(A2*B1-A1*B2);
  a2=(A2*fi-A1*fj)/(A2*B1-A1*B2);
  scanf("%d",&n);
  printf("%.0Lf\n",a1*powl(r1,n)+a2*powl(r2,n));
  return 0;
}