tj

#include <iostream>
#include <cmath>
using namespace std;
inline int readInt() {
    int s = 0, w = 1;
    char ch = getchar();
    while (ch < '0' || ch > '9') {
        if (ch == '-') w = -1;
        ch = getchar();
    }
    while (ch >= '0' && ch <= '9') {
        s = s * 10 + ch - '0';
        ch = getchar();
    }
    return s * w;
}
inline void writeInt(int x) {
    if (x < 0) {
        putchar('-');
        x = -x;
    }
    if (x > 9) writeInt(x / 10);
    putchar(x % 10 + '0');
}
int main() {
    int n = readInt();
    int x = readInt();
    int y = readInt();
    int eats = ceil(static_cast<double>(y) / x);
    int rems = max(0, n - eats);
    writeInt(rems);
    putchar('\n');
    return 0;
}