#include <bits/stdc++.h>
// #include <atcoder/all>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for(int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
// using namespace atcoder;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    int x, y, z;
    cin >> x >> y >> z;

    int ans = 0;
    srep(i,1,1001001){
        if(i*x < y*z) ans = i;
    }

    cout << ans << endl;
    return 0;
}



#include <bits/stdc++.h>
#define ll long long
#define mod 1e9 + 7
using namespace std;
int main() {
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ll x, y, z;
    cin >> x >> y >> z;
    if (ceil(((long double)(y * z) / (long double)x)) == floor(((long double)(y * z) / (long double)x))) {
        cout << floor(((long double)(y * z) / (long double)x)) - 1;
    } else {
        cout << floor(((long double)(y * z) / (long double)x));
    }
    return 0;
}