A school conducted a survey among its students regarding their preferred type of extracurricular activities. The results of the survey were displayed in a pie chart, with each section indicating the percentage of students who preferred sports, arts, music, and academics.

If 35% of the 400 students surveyed preferred sports, 25% preferred arts, 20% preferred music, and the remaining preferred academics, calculate the exact number of students who preferred academics.

Represent your answer as an integer in the grid-in format.