#define f(n)(z+n>0?(z+n)*(z+n+1)/2:0)
long long i,x,y,z,m,A,B;C,D,d;main(i){scanf("%lld%lld%d%d%d",&A,&B,&C,&D,&d);for(m=A*C<=0&B*D<=0;++i<6;x=A,A=B,B=-C,C=D,D=-x)z=d-(x=A>0?A:0)-(y=B>1?B:1),x-=C,y-=D,m+=x>0|y>0?0:f(1)-f(y)-f(x)+f(x+y-1);m=!printf("%lld",m);}