const print = std.debug.print;
const std = @import("std");
const tokenize = std.mem.tokenize;

pub fn main() !void {
    var count: usize = 0;
    defer print("{}\n", .{ count });

    var input = tokenize(@embedFile("input"), "\n");
    while (input.next()) |line| {
        var output = tokenize(line[61..], " ");
        while (output.next()) |digit|
            switch (digit.len) {
                2, 3, 4, 7 => count += 1,
                else => {},
            };
    }
}