<｜begin▁of▁sentence｜>### Instruction:
As a human rights advocate working to evaluate the impact of social networks on human rights movements, you are examining a network of activists and their connections. The graph represents these connections, where two pairs of activists are directly linked. Utilizing the vcount function from the igraph library, you are aiming to determine the total number of activists involved in the network.
### Response:
from igraph import Graph

# Create a simple graph with 3 nodes
graph = Graph(edges=[(0, 1), (1, 2)])

# Use vcount to get the number of vertices
vertex_count = graph.vcount()
print('Number of vertices in the graph:', vertex_count)
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