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#include <cstdio>
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int main()
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{
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int a, b, f, k, r, ans = 0;
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for (scanf("%d%d%d%d", &a, &b, &f, &k), r = b; k--; f = a - f)
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if (r < f || b < a - f)
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return puts("-1"), 0;
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else if (r >= a + (k ? a - f : 0))
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r -= a;
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else
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ans++, r = b - a + f;
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return printf("%d", ans), 0;
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} |
