#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;

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

	cout << (y * z - 1) / x << endl;
}
//#include<bits/stdc++.h>
#include<iostream>
#include<string>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cctype>
#include<vector>
#include<map>
#include<deque>
#include<queue>
using namespace std;

#define re register
#define inf 0x3f3f3f3f
//#define inf 0x3f3f3f3f3f3f3f3f
#define ll long long
//#define int ll
//#define x first
//#define y second

typedef pair<int,int> PII;

template<typename T>
inline void read(T &x){
	re char ch=getchar();re bool f=false;x=0;
	while(!isdigit(ch)){if(ch=='-'){f=true;}ch=getchar();}
	while(isdigit(ch)){x=(x<<3)+(x<<1)+(ch^48);ch=getchar();}
	x=f?-x:x; return ;
}

template<typename T>
inline void write(T x){
	if(x<0){putchar('-');x=-x;}
	if(x>=10){write(x/10);}
	putchar(x%10+'0');
}

signed main(){
//	freopen(".in","r",stdin);
//	freopen(".out","w",stdout);
	int x,y,z; read(x),read(y),read(z);
	int ans;
	ans=z*y;
	if(ans%x==0) ans=ans/x-1;
	else ans/=x;
	write(ans);
	return 0;
}