#include <stdio.h>
int main()
{
int L, A, B, C, D, num1 = 0, num2 = 0;
scanf_s("%d %d %d %d %d", &L, &A, &B, &C, &D);
num1 = A / C;
if (A % C != 0)
{
num1++;
}
num2 = B / D;
if (B % D != 0)
{
num2++;
}
if (num1 >= num2)
{
printf("%d", L - num1);
}
else
{
printf("%d", L - num2);
}
return 0;
}