The Sanhedrin must count seven groups of seven years

You are also to count off seven sabbaths of years for yourself, seven times seven years, so that you have the time of the seven sabbaths of years, namely, forty-nine years.

Hebrew

ח וְסָפַרְתָּ לְךָ, שֶׁבַע שַׁבְּתֹת שָׁנִים--שֶׁבַע שָׁנִים, שֶׁבַע פְּעָמִים; וְהָיוּ לְךָ, יְמֵי שֶׁבַע שַׁבְּתֹת הַשָּׁנִים, תֵּשַׁע וְאַרְבָּעִים, שָׁנָה.

Greek

8 Καὶ ἐξαριθμήσεις σεαυτῷ ἑπτὰ ἀναπαύσεις ἐτῶν, ἑπτὰ ἔτη ἑπτάκις, καὶ ἔσονταί σοι ἑπτὰ ἑβδομάδες ἐτῶν ἐννέα καὶ τεσσαράκοντα ἔτη.

• Parashah: B'har
• Sefer HaChinuch: 330
• Mishneh Torah: Seeds — The Sabbatical Year and the Jubilee

• Leviticus 25:8

Enumeration and classification from BibleData. The Greek is the Septuagint reading of the same verse, carried by the source for comparison.