#include <iostream>
using namespace std;
int main()
{
int* s = new int;
int* v1 = new int;
int* v2 = new int;
int* a1 = new int;
int* a2 = new int;
cin >> (*v1) >> (*v2) >> (*a1) >> (*a2) >> (*s);
int* s1 = new int(0);
int* s2 = new int(0);
int* t = new int(0);
while ((*s1) + (*s2) < *s) {
(*s1) += (*v1);
(*s2) += (*v2);
(*v1) += (*a1);
(*v2) += (*a2);
++(*t);
}
cout << (*t);
delete s;
delete v1;
delete v2;
delete a1;
delete a2;
delete s1;
delete s2;
delete t;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgogCnVzaW5nIG5hbWVzcGFjZSBzdGQ7CiAKaW50IG1haW4oKQp7CiAgICBpbnQqIHMgPSBuZXcgaW50OwogICAgaW50KiB2MSA9IG5ldyBpbnQ7CiAgICBpbnQqIHYyID0gbmV3IGludDsKICAgIGludCogYTEgPSBuZXcgaW50OwogICAgaW50KiBhMiA9IG5ldyBpbnQ7CiAgICBjaW4gPj4gKCp2MSkgPj4gKCp2MikgPj4gKCphMSkgPj4gKCphMikgPj4gKCpzKTsKICAgIGludCogczEgPSBuZXcgaW50KDApOwogICAgaW50KiBzMiA9IG5ldyBpbnQoMCk7CiAgICBpbnQqIHQgPSBuZXcgaW50KDApOwogICAgd2hpbGUgKCgqczEpICsgKCpzMikgPCAqcykgewogICAgICAgICgqczEpICs9ICgqdjEpOwogICAgICAgICgqczIpICs9ICgqdjIpOwogICAgICAgICgqdjEpICs9ICgqYTEpOwogICAgICAgICgqdjIpICs9ICgqYTIpOwogICAgICAgICsrKCp0KTsKICAgIH0KICAgIGNvdXQgPDwgKCp0KTsKICAgIGRlbGV0ZSBzOwoJZGVsZXRlIHYxOwoJZGVsZXRlIHYyOwoJZGVsZXRlIGExOwoJZGVsZXRlIGEyOwoJZGVsZXRlIHMxOwoJZGVsZXRlIHMyOwoJZGVsZXRlIHQ7CiAKICAgIHJldHVybiAwOwp9