#include <iostream>
using namespace std;
int main(){
string s,s1,s2,ans;
int carry=0,flag=0;
cin>>s>>s1>>s2;
ans =s;
string ss1(s.length()-s1.length(),'0');
s1 = ss1+s1;
string ss2(s.length()-s2.length(),'0');
s2 =ss2+s2;
for (int i = s.length()-1; i >=0 ; --i) {
int mod = s[i]=='0'?10:(s[i]-'0');
ans[i] = (s1[i] - '0' + s2[i] - '0' + carry) % mod + '0';
carry = (s1[i] - '0' + s2[i] - '0' + carry) / mod;
}
if(carry!=0) ans='1'+ans;
for (int i = 0; i <ans.size() ; ++i) {
if(ans[i]!='0'||flag==1){
flag=1;
cout<<ans[i];
}
}
if(flag==0) cout<<0;
return 0;
}
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