#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll mod=1000000007;
ll inf=2000000000000000007;
int main(){
    ll v,t,p;
    cin >> v >> t >> p;
    ll left=0,right=inf;
    while (right-left>1)
    {
        ll mid=(right+left)/2;
        ll x=mid-(mid-1)/t;
        if (x>(p+1)*v)
        {
            right=mid;
        }else{
            left=mid;
        }
    }
    cout << right << endl;
}