#include<iostream>
using namespace std;
int qiujiecheng(int x){
	int jc=1;
  for(int i=1;i<=x;i++){
    jc=jc*i;
  }
  return jc;
}
int main(){
  int x,s=0;
  for(int i=1;i<=3;i++){
  	cin>>x;
    s=s+qiujiecheng(x);
  }
  cout<<s;
  return 0;
}

#include<iostream>
using namespace std;
int qiujiecheng(int x){
	int jc=1;
  for(int i=1;i<=x;i++){
    jc=jc*i;
  }
  return jc;
}

int qiujiechenghe(int h,int x,int m){
  return qiujiecheng(h)+qiujiecheng(x)+qiujiecheng(m);
}



int main(){
  int h,x,m;
  cin>>h>>x>>m;
  cout<<qiujiechenghe(m,x,h)<<"\n";
  return 0;
}

//两个程序的

#include<iostream>
using namespace std;

int qiujiecheng(int x){
  int jc=1;
  for(int i=1;i<=x;i++){
    jc=jc*i;
  }
  return jc;
}

int main(){
  int x,s=0;
  for(int i=1;i<=3;i++){
    cin>>x;
	s=s+qiujiecheng(x);
  } 
  cout<<s<<"\n";
  return 0;
}

//三个程序

#include<iostream>
using namespace std;
int qiujiecheng(int x){
  int jc=1;
  for(int i=1;i<=x;i++){
    jc=jc*i;
  }
  return jc;
}


int jiechenghe(int n,int m,int h){
  return qiujiecheng(n)+qiujiecheng(m)+qiujiecheng(h);
}

int main(){
  int n,m,h;
  cin>>n>>m>>h;
  cout<<jiechenghe(n,m,h)<<"\n";
  return 0;
}

#include<iostream>
using namespace std;
int main(){
  int n,h,m,a=1,b=1,c=1;
  cin>>n>>h>>m;
  for(int i=1;i<=n;i++){a=a*i;}
  for(int i=1;i<=h;i++){b=b*i;}
  for(int i=1;i<=m;i++){c=c*i;}
  cout<<a+b+c;
  return 0;
}