#include<bits/stdc++.h> 
using namespace std;
int main() {
long long a,b,c,a1,b1,c1;
cin>>a>>b>>c;
a1=max(a,max(c,b));
b1=min(a,min(b,c));
c1=a+b+c-a1-b1;
if(c1+1==a1&&c1-1==b1){
cout<<"TRUE";
}
else{
cout<<"FALSE";
}
        return 0;
    }