#include<stdio.h>
int main()
{
    int x,a,b,c,d,max=0;
    scanf("%d%d%d%d%d",&x,&a,&b,&c,&d);
    if(x>max)
        max=x;
if(a>max)
    max=a;
    if(b>max)
        max=b;
    if(c>max)
        max=c;
    if(d>max)
        max=d;
    printf("%d",max);
    return 0;
}

/**************************************************************
	Problem: 1736
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/