#include <stdio.h> int MAX(int x , int y) { if(x > y) return x; else return y; } int main() { int num1 = 0; int num2 = 0; int num3 = 0; int num4 = 0; scanf("%d %d %d %d", &num1,&num2,&num3,&num4); int max1 = MAX(num1 , num2); int max2 = MAX(num3 , num4); int max3 = MAX(max1 , max2); printf("%d", max3); return 0; }