#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,n; cin>>a>>b>>c; for(int x=2;x<=1000000;x++){ n=a%x; if(a%x==n&&b%x==n&&c%x==n){ cout<<x; return 0; } } return 0; }