#include<bits/stdc++.h>
#define int long long
using namespace std;
int gcd(int a,int b){
    int c=a%b;
    while(c!=0){
        a=b;
        b=c;
        c=a%b;
    }
    return b;
}
int lcm(int a,int b){
    return a*b/gcd(a,b);
}
signed main(){
    int x,y,n,cnt_a,cnt_b,cnt_same,cnt=0;
    cin>>x>>y>>n;
    cnt_a=n/x;
    cnt_b=n/y;
    cnt_same=n/lcm(x,y);
    cnt=cnt_a+cnt_b-cnt_same;
    cout<<cnt<<endl;
    return 0;
}