#include<bits/stdc++.h>
using namespace std;


#define li          long long int
#define rep(i,to)   for(li i=0;i<((li)(to));i++)
#define repp(i,start,to)    for(li i=(li)(start);i<((li)(to));i++)
#define pb          push_back
#define sz(v)       ((li)(v).size())
#define bgn(v)      ((v).begin())
#define eend(v)     ((v).end())
#define allof(v)    (v).begin(), (v).end()
#define dodp(v,n)       memset(v,(li)n,sizeof(v))
#define bit(n)      (1ll<<(li)(n))
#define mp(a,b)     make_pair(a,b)
#define rin rep(i,n)
#define EPS 1e-12
#define ETOL 1e-8
#define MOD 1000000007
typedef pair<li, li> PI;

#define INF bit(60)

#define DBGP 1


#define idp if(DBGP)
#define F first
#define S second
#define p2(a,b)     idp cout<<a<<"\t"<<b<<endl
#define p3(a,b,c)       idp cout<<a<<"\t"<<b<<"\t"<<c<<endl
#define p4(a,b,c,d)     idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<endl
#define p5(a,b,c,d,e)       idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<endl
#define p6(a,b,c,d,e,f)     idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<endl
#define p7(a,b,c,d,e,f,g)       idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<"\t"<<g<<endl
#define p8(a,b,c,d,e,f,g,h)     idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<"\t"<<g<<"\t"<<h<<endl
#define p9(a,b,c,d,e,f,g,h,i)       idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<"\t"<<g<<"\t"<<h<<"\t"<<i<<endl
#define p10(a,b,c,d,e,f,g,h,i,j)        idp cout<<a<<"\t"<<b<<"\t"<<c<<"\t"<<d<<"\t"<<e<<"\t"<<f<<"\t"<<g<<"\t"<<h<<"\t"<<i<<"\t"<<j<<endl
#define foreach(it,v)   for(__typeof((v).begin()) it=(v).begin(); it!=(v).end(); ++it)
#define p2p(x)      idp p2((x).F, (x).S)
#define dump(x,n)   idp{rep(i,n){cout<<x[i]<<" ";}puts("");}
#define dump2(x,n)  idp{rep(i,n){cout<<"["<<x[i].F<<" , "<<x[i].S<<"] ";}puts("");}
#define dumpi(x)    idp{foreach(it, x){cout<<(*it)<<" ";}puts("");}
#define dumpi2(x)   idp{foreach(it, x){cout<<"["<<(it)->F<<" , "<<(it)->S<<"] ";}puts("");}

#define read2d(a,w,h)   rep(i,h)rep(j,w)cin>>a[i][j]
#define dump2d(a,w,h)   rep(i,h){rep(j,w)cout<<a[i][j]<<" ";puts("");}

typedef pair<li, li> PI;

#define PRIME_MAX 1000001

bool isp[PRIME_MAX] = {false};
vector<li> primes;

inline void prime_init() {
    repp(i, 2, PRIME_MAX)isp[i] = true;
    repp(i, 2, sqrt(PRIME_MAX) + 2) {
        if (isp[i]) {
            for (li j = 2; i * j < PRIME_MAX; j++) {
                isp[i * j] = false;
            }
        }
    }
    rep(i, PRIME_MAX)if (isp[i])primes.pb(i);
}

inline vector<PI > decom(li x) {
    vector<PI> res;
    rep(i, sz(primes)) {
        li tres = 0;
        while (x % primes[i] == 0) {
            tres++;
            x /= primes[i];
        }
        if (tres > 0)res.pb({primes[i], tres});
        if (x <= 1)break;
    }
    return res;
}

inline li njo(li a, li b) {
    li res = 1;
    rep(i, b)res *= a;
    return res;
}
li n;

li dfs(vector<PI>& d, li idx, li num) {
    if (idx == sz(d)) {
        //cout << num << endl;

        li m = n / num - 1;
        if (m <= 0)return 0;

        if (n / m == n % m)return m;
        return 0;
    }
    li res = 0;
    rep(i, d[idx].S + 1) {
        res += dfs(d, idx + 1, num * njo(d[idx].F, i));
    }
    return res;
}

int main() {
    prime_init();
    cin >> n;

    auto d = decom(n);

    cout << dfs(d, 0, 1) << endl;

    return 0;
}

Measured memory_bytes: 2424