#include<bits/stdc++.h> using namespace std; //#define ii int //#define ll long long //#define cc char //#define dd double //#define in cin //#define out cout //#define pp printf //简化 /bool sushu(int x){ if(x<2){ return false; } if(x2||x3){ return true;//TODO } for(int i=2;ii<=x;i++){ if(x%i==0)return false; }return true; } // 素数*/ int main() { int a,b,c;cin>>a>>b>>c; cout<<a*(b+c-a); return 0; }

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