#include <iostream>
using namespace std;
int main(){
int M,N,X;
cin >> M >> N >> X ;
while(N <=M && X * N >=M){
if (M%N==0)
X = X - M / N;
else
X = X - M / N -1;
N = N + M/N;
}
printf("%d",N);
return 0;
}