#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {
    int n, max, first_value=0;
    while(scanf("%d",&n)!=EOF)
    {
        if (first_value==0)
        {
        max=n;
        first_value=1;
        }
        if(n>max)
            max=n;
    }
    printf("%d\n",max);

    return 0;
}