Rashi on Leviticus 26:18/רש"י על ויקרא כ״ו:י״ח

1ואם עד אלה means AND IF, WHILE THESE ARE YET with you,לא תשמעו YOU WILL NOT HEARKEN,

2ויספתי — This together with ליסרה means, THEN I WILL ADD still other afflictions,

3שבע על חטאתיכם SEVEN punishments FOR THE seven SINS which were mentioned above (Sifra, Bechukotai, Chapter 5 1).