#include <stdio.h>

int main() {
    FILE *fptr;
    fptr=fopen("Sum.txt","r");

    int a;
    fscanf(fptr,"%d",&a);
    int b;
    fscanf(fptr,"%d",&a);

    fclose(fptr);

    fptr=fopen("Sum.txt","w");
    fprintf(fptr,"%d",a+b);
    fclose(fptr);
    return 0;
}