#include <iostream>

using namespace std;

int main(){
    freopen("C:\\temp\\in.txt", "r", stdin);
    freopen("C:\\temp\\out.txt", "w", stdout);
    int n, max = 0;
//  while(scanf("%d", &n) != EOF){
//      if(n > max) max = n;
//  }
    while(cin >> n){
        if(n > max) max = n;
    }
    cout << max << endl;
    fclose(stdin);
    fclose(stdout);
    return 0; 
}