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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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long long n, m, k, l, ans = -1;
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scanf("%lld%lld%lld%lld", &n, &m, &k, &l);
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if (m <= n && k + l <= n) {
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ans = (l + k + m - 1) / m;
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if (ans * m > n) ans = -1;
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}
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printf("%lld", ans);
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return 0;
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} |
