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

ll gcd(ll a, ll b){
  if(b == 0){
    return a;
  }
  else{
    return gcd(b,(a%b));
  }
}

int main(){
    ll ans=1,mod=1e9+7;
    int a,b,N;
    cin>>a>>b>>N;
    int vec[6];
    for(int i=a;i<=b;i++){
        for(int j=a;j<=b;j++){
            for(int k=a;k<=b;k++){
                for(int l=a;l<=b;l++){
                    for(int m=a;m<=b;m++){
                        for(int n=a;n<=b;n++){
                            vec[0]=i;
                            vec[1]=j;
                            vec[2]=k;
                            vec[3]=l;
                            vec[4]=m;
                            vec[5]=n;
                            ll GCD=vec[0];
                            for(int o=0;o<N;o++){
                                GCD=gcd(GCD,vec[o]);
                            }
                            ans*=GCD;
                            ans%=mod;
                        }
                    }
                }
            }
        }
    }
    cout<<ans<<endl;
}