#include <stdio.h>

int gcd(int a, int b)
{
	if (a == 0) return b;
	else return gcd(b % a, a);
}

int main()
{
	int A, B, C, D, E;
	scanf("%d %d %d %d %d", &A, &B, &C, &D, &E);
	
	int i, g = gcd(A + B, C + D), l = (A + B) * (C + D) / g, x[250001] = {}, sum = 0;
	for (i = 0; i < l; i++) {
		if (i % (A + B) < A && i % (C + D) < C) {
			x[i] = 1;
			sum++;
		}
	}
	sum *= E / l;
	for (i = E % l - 1; i >= 0; i--) sum += x[i];
	printf("%d\n", sum);
	fflush(stdout);
	return 0;
}