typedef long long l;l q,i,m;l f(l n){n+=m;return n>0?n*-~n/2:0;}main(s,t,u,v,d,x,y){scanf("%d%d%d%d%d",&s,&t,&u,&v,&d);for(q=!(s>0|0>u|t>0|0>v);x=s>0?s:0,y=t>1?t:1,m=d-x-y+1,x-=u+1,y-=v+1,i++<4;x=s,s=-v,v=u,u=-t,t=x)x<0&y<0?q+=f(0)-f(x)-f(y)+f(x+y):0;i=!printf("%lld",q);}