Postage range (array or + function)

describe

We post letters with stamps , There are some small stamps at the post office , Through a combination of one or more of these small Stamps , It can meet the different postage of different mail . Now? , The post office has 4 Stamps of different denominations . The maximum number of stickers on each envelope is 5 A stamp , The face value can be the same , But it's different .

Input
The face value of four kinds of stamps .

Output
The postage consisting of these four denominations is the largest from 1 A continuous interval at the beginning .

explain ： If the result is 10, Indicates the use of 4 Stamps can be combined into 1、2、3、4、5、6、7、8、9、10 These postage .

sample input 1

1 2 3 4

sample output 1

#include<stdio.h>

int main(){
    
	int a,b,c,d;
	scanf("%d %d %d %d",&a,&b,&c,&d);
	int max=1;
	int i,j,k,h;
	int flag;
	A:for(i=0;i<=5;i++){
    
		for(j=0;j<=5-i;j++){
    
			for(k=0;k<=5-i-j;k++){
    
				for(h=0;h<=5-i-j-k;h++){
    
					flag = 1;		
					if(a*i+b*j+c*k+d*h==max){
    
						flag = 0;
						max++;
						goto A;
					}
				}
			}
		}
	}
	if(flag==1){
    
		printf("%d.",max-1);		
	}
}