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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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    int x, y, p;
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    cin >> x >> p >> y;
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    x *= 100;
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    y *= 100;
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    int year = 0;
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    while (x < y) {
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        x = x + x * p / 100;
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        year++;
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    }
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    cout << year;
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    return 0;
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}