#include<stdio.h>

char*buf;
size_t bufS;
FILE*ss=open_memstream(&buf,&bufS);
FILE*fin,*fout;
int main()
{
    fin=fopen("adunare.in","r");
    fout=fopen("adunare.out","w");
    int a,b;
    fscanf(fin,"%d%d",&a,&b);
    fprintf(ss,"%d %d",a,b);
    fflush(ss);
    int c,d;
    fscanf(ss,"%d %d",&c,&d);
    fprintf(fout,"%d",c+d);
    fclose(fin);
    fclose(fout);
    return 0;
}