#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int a,b,c,i=2; cin>>a>>b>>c; while(1){ if((a%i)==(b%i)&&(b%i)==(c%i)){ cout<<i; break; } i++; } }